Ifrit.Bloodbathboy said:
Well I got all my avatars except for Feny and Dia!!! I was told I have to collect the wispers from the avatars I already have. Is this correct??? Any advice for these two fights??
That is just for Fenrir. You only need to collect all the whispers to get your first moon bauble.
You can start Diabolos Prime if you've beaten CoP 3-5.
For Diabolos lots of stuns help, if possible have a Nightmare stun order. I like to TP burn this but it helps if you have DRKs in your DD and BLMs for stun. RDM/DRK is good on this for chainspell stun. For the most part if you can stun Nightmare, Diabolos should go smoothly.
Haven't done Fenrir as much but usually TP burned it.