well, my plan for this ragnarok is to get to 100% burst as fast as possible and stun her so tyr can finish her off in that turn.
so having ramiel that can give me 10% burst gauge+ attack and defense buff seem to be good for my party in general, but as said the dizzy effect may come against me if i use that skill and she get dizzy.
in both of you comments it seem like arc is the soul i should pick, but still not sure what extra skill will come in more in handy, sniper shot to decrease more the damage and defense or black propaganda?
with sniper shot i can deal more damage and recieve less damage along arc debuff and 3 kami that cut the damage.
and with black propaganda i can delay the super move time and maybe get less hits with it (although it may fill up my burst gauge faster)

kitty-
how much attack debuff and defense buffs the user had in that battle?
i haven't saw her getting any buff, but her debuff is freezing the CD of skills, let say i used gaia skill and have to wait 6 turns till i can use it again, then that debuff will keep it at 6 turns waiting for some turn (forgot for how long)
so i may not be able to use that skill again till the end of the battle :O
and well, i don't have a full thunder grid so i can use the SSR wind axe so she can have a little more hp, but without main eidolon and suppot eidolon to boost HP she won't have that much indeed.