Consolidated Thread With All V25 Strategies

PLD WAR BRD COR GEO WHM

Video:
https://www.youtube.com/watch?v=Z7B02Cb6OMw

Lobby bubbles: PLD Haste, WAR Frailty, BRD STR, COR Fend, WHM Refresh

Start with strong buffs (SV, nitro, Crooked, etc.) Use BoG/Ecliptic with Widened Compass from 100 -> 40%, Bolster 40% -> 0.
Hmarch, 2 Minuet, Dirge, Fire Carol II, Crooked Chaos, regular Samurai, Indi-Barrier, Geo-Fury. Entrust Indi-Haste on tank.

GEO: When adds are out attempt to sleep them. If Meva/Mdef auras, swap barrier to appropriate opposite bubble
WHM: Keep dia up, try to slow/paralyze if you have time. Haste the DDs, re-apply Auspice and other buffs as they come down. Lots of curagas, but if you have the opportunity, use single target cures for cureskins. When fetters are up, watch the PLD's HP as they may get hosed.
PLD: Spam enmity JA on cooldown, use Atonement/flash on cooldown. I keep Rampart available for fetter modes, and use everything else as often as possible. Reapply Crusade/Majesty after being dispelled. Help cure when possible
WAR: We found axe to do the most damage, alternating between Calamity/Mistral Axe. Use Warcry then call for RD. At around 40% use your 1hrs then call for WC. Don't use these if you're weakened
BRD: Savage spam, don't bother reapplying songs to tank when he gets dispelled, we need your DPS. Apply Elegy/Requiem during the nitro. Try to apply Elegy to the adds when they come out, if you have a Nitro. Help with blue procs as necessary
COR: Savage spam, enhance dia/slow/para with shots. Use RD/WC as called for. Get a free 6, you lazy ***

SC for axe is Raging Axe -> Savage Blade, back and forth until it blue procs.
SC for Gaxe is Steel Cyclone -> Savage Blade, back for forth until it blue procs.

PLD RUN DRK BLU BRD COR.

Editor's note: possibly relevant video, but not precisely the same strategy:
https://youtu.be/PbzU5aX8yb8

Recommended Medicine: Panacea, Vile Elixir/+1 (Bazaar Elixirs for PLD and BLU; they'll be curing a lot if MEva Down aura occurs)

Don't knock off aura. He loses access to Incinerating Lahar while aura is up which is very helpful for the DDs. Coordinate WSs that won't 3-step or create Fusion/Light. We used Torcleaver/Resolution, Savage Blade, Expiacion. The only SC that can be made is a 2-step Distortion. No 3-steps or Fusions/Lights are possible. DDs can avoid Fetter damage by standing behind Kalunga near max attack range. Have fun with knockback spam.
Lobby bubbles: Fury (DRK), STR (COR), Refresh (BLU), Refresh (PLD), Focus (RUN)

PLD - Hold adds and cure the party. Prioritize the RUN since the BLU can heal the DDs if needed. It may be difficult to get the 40% add off the DRK. However, by that time Invincible should be safe to use as a tool of getting hate on the 2nd add. The RUN shouldn't lose hate, at least I didn't.
RUN - Kalunga tank. Find a spot to tank where you won't get knockbacked. Open with Armor Break. Entrust Focus/Flabra Rayke/Tropical Crepe/SV Wind Threnody allowed for a fair chance of Armor Break's Defense Down landing at the start of the fight. I didn't have AF+4 MAcc either. Keep Refresh up on PLD and BLU. Searing Serration can potentially 1-shot you if you don't have Vallation or Valiance up, so make sure you reapply at safe times. Try to ride your Valiance timer as your DDs will appreciate it. If MEva Down aura is up, consider walking close up to Kalunga to hit DDs with One For All when Valiance falls, then move back to your wall to keep Fetters from popping on them.
DRK - Ours used Caladbolg and alternated between Torcleaver and Resolution. Fimbulvetr can open the possibility of accidentally 3-stepping and removing Aura which we didn't want to happen. Blood Weapon when 2nd add pops since you'll likely have hate on the add for a while (I honestly don't even know if BW's HP absorption takes effect on V25s. This just came to mind as I was writing up, but if it works, it'd be handy to lower the threat of the 2nd add). Can Soul Enslavement at some point under 40% as well.
BLU - Expiacion. Assist healing the DDs with White Wind if needed. Unbridled Wisdom Carcharian Verve and Diffusion Mighty Guard at the start, or consider a max SIRD White Wind set. Fulltime AoE Mighty Guard the whole fight with the help of RD/WC.
BRD - Honor March, Minuet x3, Dirge on DDs. Minnes/Ballads on PLD. Wind Threnody/Requiem on Kalunga while SV T/N's up at the start. Can either help DD or focus on reapplying dispelled RUN songs (March/Ballad/Carol, whatever the RUN's request) or a mix of both depending on your group's needs. Our BRD didn't DD at all but we still managed to beat it.
COR - Savage Blade. Crooked Chaos/Samurai rolls. Use RD/WC for resetting Diffusion and Last Resort.

BRD COR GEO MNK PUP WHM

Videos:
https://www.youtube.com/watch?v=aeBtG9rYQ_s
https://www.youtube.com/watch?v=Uh7Yfa2674k

Lobby bubbles: Frailty MNK, STR PUP, Refresh WHM, Focus BRD
Indi-Barrier, Geo-Fury, Entrust Indi-Fend
HMarch, Minuet V, Minuet IV, Scherzo, Water Carol II
Crooked Chaos/Sam. After these are done, do Tacticians on BRD and yourself
All the usual buffs

MNK: When Footwork is up, use TK and Godhands. When Footwork is down, Vere and VS with Impetus. With RD/WC, at least one of these should always be available. Don't forget Mantra, Chi Blast, etc. Chakra/Inner Strength in case of emergency
PUP: Use Godhands and Howling Fist spam, mix in Stringing Pummel if you get walled. When first add pops, put your puppet on it. If you have hate, move out to range and Ventriloquy it onto the puppet. If someone else has hate, the puppet will have to take it manually. For second add, engage puppet on the add then use 1hr to make the puppet benediction for hate
WHM: Do WHM things. Barwatera, Barsleepra, Haste, Regen (when possible). Can land some debuffs on him (Slow, Para, Dia)
GEO: Do the buffs above, recast bubbles as they die. Use BH/Judgment. Make use of Dematerialize to keep bubble alive. Bolster sub-40%
BRD: Buffs above, try to get debuffs on boss during nitro. Save TP for fetters (second and third)
COR: Buffs above, save TP for fetters (second and third)

Someone (MNK? BRD?) should do Shell Crusher at the start of the fight with 3k TP. During fetters, 1 person starts the proc window then everyone else hits at once. Call out opening. For all fetters, make sure everyone is using unique WS, no repeats including/especially from the same person. For first fetter, MNK, PUP, GEO should be able to proc it (COR might as well throw in Leaden as well). For second, COR is necessary, maybe BRD as well. For third proc, if there is one, All 5 must participate.

WAR/MNK/BRD/GEO/WHM/RDM
Everyone eats defensive food
War - loxitic, spams judgment, do war things
MNK - Open fight with spiral, swap to howling fist, reapply spiral @3k every 4-5 ws. chi blast as often as you can.
BRD: honor, x2 atk, sentinel, water carol 2, DPS with staff, keep shell crusher on it.
geo: geo-fury, indi-barrier, entrust str when up. melee with club using idris ws.
WHM: Auspice, barwater, pro/shell, boost-str, barsleepra.
RDM: Black halo spam, keep dia 3, slow/para on ngai, bio3, slow/para on adds. This basically neuters them.

Everyone stays within 5 yalms and kills it. Shadow rings and warders charms help with the insta KO for the mnk/war. Dont stack, but stay inside the geo bubble.

PLD DNC COR DRG WHM BRD

Videos:
https://www.youtube.com/watch?v=NsgJUs14B6Y
https://www.youtube.com/watch?v=FRsgsC0wS3Q

Lobby bubbles: Fury DRG, Fend COR, Frailty BRD, Barrier PLD, DEX DNC

WHM make sure to always keep up aquaveil (check set to make sure the +Aquaveil pieces are there) and make sure to have 50% DT in idle and cure midcast sets. Try to use Asylum early-ish in the fight to catch the first Droning Whirlwind and prevent it from dispelling the group. This is typically after ~15-45 seconds of engaging.
DRG keep up Stardiver debuff, spams Impulse Drive (with Shining One)
DNC keep up haste samba, box and feather steps, uses Rudras. May need to help with cures, ideally not. Might remove para from WHM if he's sacrificing zombie off people.
COR Sam/Chaos on the party. Use Last Stand for damage primarily, switch to Evisceration during fetters.
BRD Scherzo (most important), Wind Carol II, HMarch, 1 Minuet, 1 Minne. Minne/Ballads for WHM, Ballad for PLD. Use Mordant Rime except during fetters.
PLD mostly help cure everybody, but also try to get hate on the little adds (but not boss). Save Rampart for the fetter times as necessary.

Everyone stacks in a pile for aoe cures. During fetter proc window, BRD, DNC, and COR switch to Evisceration, it should proc VERY fast.

PLD NIN RDM SMN BST BLU
PUP DRG WAR WHM GEO DNC
BRD COR THF BLM RUN SCH

Video:
https://www.youtube.com/watch?v=Aqmj2Iivs1A

First KI:
Lobby: Malaise, Acumen, Focus, Languor, INT
PLD + NIN make Gravitation (Shun -> Requiescat)
Shun -> Primal Rend -> CDC makes 3-step Darkness
BLU can CA with Quad. to make 3-step Darkness
NIN bursts 2-3 ninjutsu on every SC
BLU bursts when possible, otherwise spams hard.
BST uses Fatso to remove TP the whole time
RDM use enspells to do damage, use Stymie Frazzle. Silence, Slow, Para.
SMN use Diabolos to do damage with Night Terror

Second:
Lobby: STR, Haste, Barrier, DEX
PUP tanks boss with magic-resistant (RUN) puppet.
DRG does most of the damage, Impulse spam with Shining
WAR tank and also do Impulse spam
DNC keep up Box/Feather, do damage, help cure sometimes.
GEO Geo-Fury, Indi-Frailty, Entrust Barrier. BoG/Ecliptic -> Bolter -> BoG/Ecliptic, nuke on Darkness SC
WHM keep people alive

It helps if the PUP can call out when fetters spawn since it wipes debuffs off the bird. There is a cheese strat involving the GEO popping the add with a nuke then dying, which makes Ongo go idle (if no one else has touched him). In this strat, you can add another DD in place of PUP

Third:
Lobby: Int, Acumen, Malaise (RUN), Focus, Barrier (BRD)
VMarch, 2 INT Etude, Ballad, Minne. Put Nitro songs up with ~12 minutes left, drop Threnody/Elegy during this
Crooked Tactician's/Wizards
SCH always makes Gravitation and keeps Helix up. Try to find time to keep all buffs up. This is not really a race.
BLM make sure to keep up -ja stacks and get as many nukes in the window as possible, including pre-casting, ideally long nukes.
RUN and COR SC as much as possible, THF and BRD fill in when possible.
Time Subtle Sorcery when lots of SC will be coming out.
Use RD/WC/RD as strats/Rayke/Gambit are on cooldown. Only WC after all 1hrs are used, ideally sub-40
BRD should get hate on the add (Caper if needed) and kite it rather than hanging with the group.
THF uses Larceny on the second Sforzo
Spam SC hard during TR.

Having spent considerable time doing Ongo v25 lately for alts and friends, I thought
I'd do a writeup to help struggling groups and clear up some misconceptions I've seen in
previous posts. The strategy uses a single KI, and has won with both MAB and MACC down
auras -- even in the same run, even below 40%. This fight is all about maximizing Gambit
and Rayke windows, so this strategy aims to do that.

Pre-pull:

RUN will be tanking this in 1h axe. After self-buffing, they can help to Shell 5 the party.
COR starts with wizards, then follows that up with crooked tacticians (you need to hit a 5,
9, 10, or 11 if COR/RUN are to extend every single skillchain.) Right after pull, you will
apply miser's roll to yourself and the RUN.
BRD pops Clarion Call and puts up 2 marches, an etude, and 2 ballads.
SCH needs to be conservative with strategems here. You should be pulling Ongo by 13 minutes on
the clock, meaning you have roughly 4 strategems at your disposal for buffing. Use those on
AOE Protect 5, AOE+Perp Regen 5, and to get into Addendum: Black. The other buffs to put up
are adloquium on the RUN and COR, Sandstorm 2 on the SCH and BLM, Klimaform, Animus Minuo
on the SCH, and Animus Augeo on the BRD.

Pull:
The goal is to hit 75% in 3 elongated skillchains (6 strategems.) This is roughly 10:30
on the encounter timer. If you're not hitting it there, more than likely gambit/rayke timings
aren't being maximized and/or earth shots aren't hitting the high value spells.
On pull, the BRD pops SV and Nitro, applies a strong Earth threnody to the boss, re-ups
previous buffs, then Tenuto's themself with 2x mambos and 3x minnes. Once buffs are good,
they can spam Lullabies/Tier 1 threnodies on the boss in an enmity set to try and build
enmity.
The RUN applies gambit exactly when Gravitation starts, then applies Rayke as soon as
possible afterwards while extending gravitations with Ruinator.
The COR applies Miser's roll to the COR+RUN while extending Ruinators with Wildfire, and
using Earth Shot on Stone 6's.
GEO runs Indi-INT + Blaze/EA Geo-Malaise + Entrust Acumen.
The SCH opens gravitation, applies a nice helix, and nukes liberally. During a typical
skillchain, you can land T5+T4+T3+T5+T2 off of the RUN's darkness and the COR's double darkness.
The BLM free-casts Stoneja to begin stacking the buff, bursts an Impact off of the first
Gravitation, then bursts as expected. Importantly, the BLM should free-nuke in between skillchains
and continue stacking the -ja buff.

75%:
BRD begins building enmity on the add.

SCH pops Tabula Rasa immediately and begins buffing:
Accession + Perpetuance Sandstorm 2
Perpetuance Adloquium RUN
Perpetuance Adloquium COR
Refresh Klimaform

Everyone runs into the RUN
Random deal
Accession + Perpetuance Embrava
Accession + Perpetuance Regen 5

Around this time the bird starts taking damage again, so it's time to Bolster, Rayke, Gambit, get
another nice Helix up, and start pushing to the lower 40%'s. Do not push it into its 2nd 2-hour yet.

Around the time Tabula Rasa is falling, Ongo should be in the mid-to-lower 40's. You will hold it there,
within a single skillchain of 40%, until Rayke is 45 seconds from coming back up.

The COR can use this waiting period as an opportunity to reapply the same 3 rolls.

With Rayke at 45s, use as few strategems as possible to push Ongo into its second Sforzo. A useful
strategem saver is True Strike - Immanence Noctohelix. Both the SCH and BLM should have TP due to
Tacticians.

40%:
Everyone except the RUN runs far enough away to SCH SP2 the adds onto the BRD. From that point foward,
the BRD will kite the adds away from the group. The BRD needs to find an oppotunity in the next ~1.5 minutes
to reapply a strong Earth Threnody II. If they got JA's back with the first random deal it can be done now.
If not, they need to do a drive-by during the upcoming Wild Card for JA's, and reapply it then.

After 30 seconds have elapsed and the group has reassembled 20+ yalms from Ongo, the BLM can pop SP2 and get
Burn up along with a new Impact. Be sure to reapply Burn with a couple seconds remaining on SP2.

With Gambit and Rayke off cooldown naturally, do 3 elongated skillchains, and be sure to apply a new Helix.

And the end of those skillchains, run in for Wild Card.

With Gambit and Rayke reset, do 3 more elongated skillchains.

And the end of those skillchains, run in for Random Deal.

With Gambit and/or Rayke reset, do 3 more elongated skillchains.

Ongo should be long dead at this point -- likely even before the last random deal. But if it's not and
Wild Card didn't reset any 2-hour abilities, you're likely out of gas. You can abuse True Strike into
Noctohelix to try and eek out a win, or come back and try to clean up execution. Any successful 2-hour
reset from the COR should be a free win, even under unfavorable auras, considering all of the things it
gives you back (more rayke/gambits, random deals, BLM SP2, Bolster, and Tabula Rasa.)

As far as auras go, we countered MAB down with Indi-Acumen, and MACC down can be ignored entirely. Your ability
to ignore MACC down depends entirely on the BRD sticking that buffed Threnody -- so keep an eye on that. Remember
to reapply Klimaform going into the final push if MACC down was your first aura, as it overwrites it.

RUN RDM SCH BST SMN DRK
BLU BRD COR WAR WHM PLD

Videos:
https://www.youtube.com/watch?v=yZEEE4Hi1OM
https://www.youtube.com/watch?v=WKfNfhbgbPs

First KI:
Lobby Bubbles:
Haste SMN, Barrier RUN, Frailty BST, STR SCH, Fury DRK

BST: Open with vermin KI, then Fatso TP Drainkiss every 30s for the rest of the fight. Can attempt another KI if JA permit
RUN: Stay disengaged and keep stoneskin up.
DRK: Open with Armor Break. Make sure TP and WS sets have capped SB in them. Alternate WS (Cross, Quietus, Insurgency) so you don't wall yourself. Use Soul Enslavement if we can afford to sacrifice second KI 1hr. Don't forget to drain STR, keep LR & Scarlet Delirium on cooldown.
SCH: Heal and buff people. Use TR at ~9 minutes and keep Embrava up on everyone. Asc Stoneskin to maintain it
RDM: Haste 2 everyone, enfeeble the ***out of Mboze (and the add once it spawns).
SMN: Hastega II, Crimson Howl, Crystal Blessing, Wind's Blessing. Mew on cooldown. Reapply buffs with Apogee mid-fight. Alternate Mewing & Predator Claws

Second KI:
Lobby Bubbles:
Fury WAR Refresh BLU STR BRD Frailty COR Attunement PLD

WAR: Open with Armor Break, keep hate on the boss the whole time. Use Axe with Calamity/Mistral. Alternate WS so you don't wall yourself
BLU: feather tickle/Reaving Mboze on CD, heal as necessary (White Wind). Expiacion on Mboze. Use Diffusion for Mighty Guard
PLD: Open with Savage Blade to proc Invincible. Cure people, tank both of the adds. Try not to get hate on Mboze
BRD: HM, 3 minuet, 1 Minne. PLD & WHM get Ballads. Elegy adds, Wind Threnody on Mboze. TP adds, WS boss (savage)
COR: Chaos/Sam, TP adds WS boss.
WHM: Heal, remove debuffs. Barpara/stone. Caress the Paralyze away

SMN BST DRG RDM WHM DNC
BRD COR RNG GEO PLD RUN

Video:
https://www.youtube.com/watch?v=vF7bwWFha-c

First KI:
Lobby bubbles: DEX WHM, Haste SMN, STR BST, Frailty DRG, Fury DNC
BST: Start with Killer Instinct, then switch to Fatso and rotate TP Drainkiss with the SMN. Re-apply KI when it wears off, assuming you have JA for it.
SMN: Alternate Mewing Lullaby with BST, do Hysteric Assault between. Get as many buffs up as you can at the start, then use Apogee to reapply them as they're coming off. AFAC for some extra damage if you can afford the 1hrs for second KI.
DRG: Prime polearm is the best, but barring that use Shining one. Don't forget Angon, etc. (note: this spot can also be taken by a WAR doing similar things)
RDM: Apply debuffs to Arebati, once add pops, get it bound/gravitied/slept out of range
WHM: Cure people
DNC: Box/Feather steps, Haste Samba, DD

Second KI:
Lobby Bubbles: Refresh BRD, Frailty RUN, STR COR, DEX RNG, Barrier PLD
PLD: Main heals and tanking both pigs. Prioritize taking 0 or close-to-0, then get the best healing set you can
RUN: Tanking main boss. Focus on enmity as hard as you can, spam spells and JA on CD. Don't change gear at all, encumbrance can get you killed.
RNG: Do shitloads of damage. Probably starting with Annihilator to avoid pulling hate. Use Gandiva/Armageddon only if necessary. Get Hover Shot capped out for damage. Mostly Coronach, but if you need can use Detonator (Slug Shot if COR doesn't have prime), or just shoot for white damage
COR: Crooked Chaos/Sam rolls, do as much damage as you can with Terminus/Last Stand. If no prime, Last Stand/Detonator
BRD: Minuetx3, HMarch, Dirge (COR) AGI Etude (RNG). 2 Minne 2 Ballad VMarch for PLD, Ice carols, Minne, March, Ballad on RUN
GEO: Geo-Fury, Indi-AGI. Open with BoG/Ecliptic, use Bolster for 40%. Use Entrust to re-apply Frailty to RUN

WAR MNK DRG BST BRD WHM
RUN SCH BLU COR GEO RDM

Video:
https://www.youtube.com/watch?v=I2H68O_KkvM

First KI bubbles: WAR Fury, MNK Frailty, DRG STR, BRD Fend, BST Barrier
Goal is to get Bumba to 75%, lower is better. Some TP moves are getting off here and we're just healing through it. Denounce/fetters can/will kill you.

WAR: Figure out which weapon works best. We're trying to avoid SC, so keep that in mind. Guide says Savage. Use MS/BR as applicable
BRD: HMarch, 4 Minuets. Savage Blade spam. Use SV/CC
DRG: Use Camlann's. Ancient Circle/Angon, use FH/SS as applicable
BST: First use HP down Ooze, then Unleash TP Drainkiss. Use Calamity.
WHM: Debuff Bumba, keep everyone alive
MNK: Chi Blast, use Dragon Kick. Can use HF

Second KI bubbles: RUN Malaise, SCH Haste, BLU Fend, COR Precision, RDM Focus

This fight is all about hitting big Kaustras and Helices, so pretty much all focus is on that. COR can do some Darkness with Leaden (others need to help break up WS wall) at the end after the last Kaustra hits.
RUN: Gambit/Rayke for Kaustra, Hold the adds but not the boss.
SCH: Caper on BLU after add is out & RUN has Gambit'd (optional). Stone - Aero - Stone - Aero - Noctohelix SC, BLU close with CA Barbed Crescent. Land Kaustra at the end of it. Also try to get a good helix up. If Kaustra resists, try it again. Should be 80k+. May need to make Distortion for the COR at the end.
RDM: Frazzle, Silence, Paralyze, Slow, Distract on Bumba. Impact before SC. Grav/Bind/Sleep the adds. Slow/Para as possible.
BLU: Tanking Bumba, keep Magic Barrier up at all times. Use Reaving Wind to keep his TP down. For Kaustra you should have: Tearing Gust & Searing Tempest up. Plenilune for SCH before he casts Kaustra. Keep Saline Coat up and use Fantod/Jettatura for hate.
COR: Crooked Wizard's Roll, regular Monks. RD for BLU JA, Rayke, Gambit. WC once TR/Bolster go down. Fire shot after tempest. Get TP from adds and then close Darkness with Leaden at the end
GEO: Bolster for first Kaustra, need 2nd Bolster. Geo-INT, Indi-Acumen

PLD RUN DRK BLU BRD COR.
Recommended Medicine: Panacea, Vile Elixir/+1 (Bazaar Elixirs for PLD and BLU; they'll be curing a lot if MEva Down aura occurs)

Don't knock off aura. He loses access to Incinerating Lahar while aura is up which is very helpful for the DDs. Coordinate WSs that won't 3-step or create Fusion/Light. We used Torcleaver/Resolution, Savage Blade, Expiacion. The only SC that can be made is a 2-step Distortion. No 3-steps or Fusions/Lights are possible. DDs can avoid Fetter damage by standing behind Kalunga near max attack range. Have fun with knockback spam.
Lobby bubbles: Fury (DRK), STR (COR), Refresh (BLU), Refresh (PLD), Focus (RUN)

PLD - Hold adds and cure the party. Prioritize the RUN since the BLU can heal the DDs if needed. It may be difficult to get the 40% add off the DRK. However, by that time Invincible should be safe to use as a tool of getting hate on the 2nd add. The RUN shouldn't lose hate, at least I didn't.
RUN - Kalunga tank. Find a spot to tank where you won't get knockbacked. Open with Armor Break. Entrust Focus/Flabra Rayke/Tropical Crepe/SV Wind Threnody allowed for a fair chance of Armor Break's Defense Down landing at the start of the fight. I didn't have AF+4 MAcc either. Keep Refresh up on PLD and BLU. Searing Serration can potentially 1-shot you if you don't have Vallation or Valiance up, so make sure you reapply at safe times. Try to ride your Valiance timer as your DDs will appreciate it. If MEva Down aura is up, consider walking close up to Kalunga to hit DDs with One For All when Valiance falls, then move back to your wall to keep Fetters from popping on them.
DRK - Ours used Caladbolg and alternated between Torcleaver and Resolution. Fimbulvetr can open the possibility of accidentally 3-stepping and removing Aura which we didn't want to happen. Blood Weapon when 2nd add pops since you'll likely have hate on the add for a while (I honestly don't even know if BW's HP absorption takes effect on V25s. This just came to mind as I was writing up, but if it works, it'd be handy to lower the threat of the 2nd add). Can Soul Enslavement at some point under 40% as well.
BLU - Expiacion. Assist healing the DDs with White Wind if needed. Unbridled Wisdom Carcharian Verve and Diffusion Mighty Guard at the start, or consider a max SIRD White Wind set. Fulltime AoE Mighty Guard the whole fight with the help of RD/WC.
BRD - Honor March, Minuet x3, Dirge on DDs. Minnes/Ballads on PLD. Wind Threnody/Requiem on Kalunga while SV T/N's up at the start. Can either help DD or focus on reapplying dispelled RUN songs (March/Ballad/Carol, whatever the RUN's request) or a mix of both depending on your group's needs. Our BRD didn't DD at all but we still managed to beat it.
COR - Savage Blade. Crooked Chaos/Samurai rolls. Use RD/WC for resetting Diffusion and Last Resort.

Having spent considerable time doing Ongo v25 lately for alts and friends, I thought
I'd do a writeup to help struggling groups and clear up some misconceptions I've seen in
previous posts. The strategy uses a single KI, and has won with both MAB and MACC down
auras -- even in the same run, even below 40%. This fight is all about maximizing Gambit
and Rayke windows, so this strategy aims to do that.

Pre-pull:

RUN will be tanking this in 1h axe. After self-buffing, they can help to Shell 5 the party.
COR starts with wizards, then follows that up with crooked tacticians (you need to hit a 5,
9, 10, or 11 if COR/RUN are to extend every single skillchain.) Right after pull, you will
apply miser's roll to yourself and the RUN.
BRD pops Clarion Call and puts up 2 marches, an etude, and 2 ballads.
SCH needs to be conservative with strategems here. You should be pulling Ongo by 13 minutes on
the clock, meaning you have roughly 4 strategems at your disposal for buffing. Use those on
AOE Protect 5, AOE+Perp Regen 5, and to get into Addendum: Black. The other buffs to put up
are adloquium on the RUN and COR, Sandstorm 2 on the SCH and BLM, Klimaform, Animus Minuo
on the SCH, and Animus Augeo on the BRD.

Pull:
The goal is to hit 75% in 3 elongated skillchains (6 strategems.) This is roughly 10:30
on the encounter timer. If you're not hitting it there, more than likely gambit/rayke timings
aren't being maximized and/or earth shots aren't hitting the high value spells.
On pull, the BRD pops SV and Nitro, applies a strong Earth threnody to the boss, re-ups
previous buffs, then Tenuto's themself with 2x mambos and 3x minnes. Once buffs are good,
they can spam Lullabies/Tier 1 threnodies on the boss in an enmity set to try and build
enmity.
The RUN applies gambit exactly when Gravitation starts, then applies Rayke as soon as
possible afterwards while extending gravitations with Ruinator.
The COR applies Miser's roll to the COR+RUN while extending Ruinators with Wildfire, and
using Earth Shot on Stone 6's.
GEO runs Indi-INT + Blaze/EA Geo-Malaise + Entrust Acumen.
The SCH opens gravitation, applies a nice helix, and nukes liberally. During a typical
skillchain, you can land T5+T4+T3+T5+T2 off of the RUN's darkness and the COR's double darkness.
The BLM free-casts Stoneja to begin stacking the buff, bursts an Impact off of the first
Gravitation, then bursts as expected. Importantly, the BLM should free-nuke in between skillchains
and continue stacking the -ja buff.

75%:
BRD begins building enmity on the add.

SCH pops Tabula Rasa immediately and begins buffing:
Accession + Perpetuance Sandstorm 2
Perpetuance Adloquium RUN
Perpetuance Adloquium COR
Refresh Klimaform

Everyone runs into the RUN
Random deal
Accession + Perpetuance Embrava
Accession + Perpetuance Regen 5

Around this time the bird starts taking damage again, so it's time to Bolster, Rayke, Gambit, get
another nice Helix up, and start pushing to the lower 40%'s. Do not push it into its 2nd 2-hour yet.

Around the time Tabula Rasa is falling, Ongo should be in the mid-to-lower 40's. You will hold it there,
within a single skillchain of 40%, until Rayke is 45 seconds from coming back up.

The COR can use this waiting period as an opportunity to reapply the same 3 rolls.

With Rayke at 45s, use as few strategems as possible to push Ongo into its second Sforzo. A useful
strategem saver is True Strike - Immanence Noctohelix. Both the SCH and BLM should have TP due to
Tacticians.

40%:
Everyone except the RUN runs far enough away to SCH SP2 the adds onto the BRD. From that point foward,
the BRD will kite the adds away from the group. The BRD needs to find an oppotunity in the next ~1.5 minutes
to reapply a strong Earth Threnody II. If they got JA's back with the first random deal it can be done now.
If not, they need to do a drive-by during the upcoming Wild Card for JA's, and reapply it then.

After 30 seconds have elapsed and the group has reassembled 20+ yalms from Ongo, the BLM can pop SP2 and get
Burn up along with a new Impact. Be sure to reapply Burn with a couple seconds remaining on SP2.

With Gambit and Rayke off cooldown naturally, do 3 elongated skillchains, and be sure to apply a new Helix.

And the end of those skillchains, run in for Wild Card.

With Gambit and Rayke reset, do 3 more elongated skillchains.

And the end of those skillchains, run in for Random Deal.

With Gambit and/or Rayke reset, do 3 more elongated skillchains.

Ongo should be long dead at this point -- likely even before the last random deal. But if it's not and
Wild Card didn't reset any 2-hour abilities, you're likely out of gas. You can abuse True Strike into
Noctohelix to try and eek out a win, or come back and try to clean up execution. Any successful 2-hour
reset from the COR should be a free win, even under unfavorable auras, considering all of the things it
gives you back (more rayke/gambits, random deals, BLM SP2, Bolster, and Tabula Rasa.)

As far as auras go, we countered MAB down with Indi-Acumen, and MACC down can be ignored entirely. Your ability
to ignore MACC down depends entirely on the BRD sticking that buffed Threnody -- so keep an eye on that. Remember
to reapply Klimaform going into the final push if MACC down was your first aura, as it overwrites it.

WAR/MNK/BRD/GEO/WHM/RDM
Everyone eats defensive food
War - loxitic, spams judgment, do war things
MNK - Open fight with spiral, swap to howling fist, reapply spiral @3k every 4-5 ws. chi blast as often as you can.
BRD: honor, x2 atk, sentinel, water carol 2, DPS with staff, keep shell crusher on it.
geo: geo-fury, indi-barrier, entrust str when up. melee with club using idris ws.
WHM: Auspice, barwater, pro/shell, boost-str, barsleepra.
RDM: Black halo spam, keep dia 3, slow/para on ngai, bio3, slow/para on adds. This basically neuters them.

Everyone stays within 5 yalms and kills it. Shadow rings and warders charms help with the insta KO for the mnk/war. Dont stack, but stay inside the geo bubble.