4) Empty Apex mobs in the crags. They have different elemental weaknesses which makes chaining slightly harder, but they aren't a bother (do little damage and no enfeebles) and camps will always be available
The basic Empty have no debuffs but according to the zone and area there will be another type of empty.
The bigger ones in Holla have an AoE Blind that gives roughly -60 Acc.
It's certainly not a big deal but considering they already need what, >1550 acc to cap? Well, you get the idea.
Also the small flying Empty are certainly not a danger in term of TP moves BUT
They hit hard and have very high Accuracy (evasion builds not very good for pullers there), watch out if you're not a tank and want to pull 20000.
Also they can't be slept with Lullaby, but Sleepga lands just fine, except on the dark based ones which are obviously immune.
Last but not least they do have an AoE TP move. It's not exactly very dangerous but if you're fighting like 4 of them at the same time it means that you can't really expect to survive with a trust healer or just regen5, you're gonna need proper healing.
The specific monster of Mea instead is a big guy (the ones that use occultation) that can slow down your kills thanks to that. Also they can't be debuffed. If you debuff them they will "spread" their debuffs to anybody around.
I don't remember what the specific monster of Dem is, but there's barely any viable camp in Dem anyway.
In Mea there's a good camp at the beginning and then nothing until you get to floor 4 where there are 2 good camps.
For comparison Holla has more viable camps. 1-2 at start on floor 1, and then a couple on floor 2, think there's 1-2 more on the last floor.