u nid 2 chain atker, luneth as finisher, 1 debuffer and 1 buff/healer for most of the raids...focus on 9S TMR 1st if u didnt have decent buff or chain atker

no doubt luneth is an atker, but luneth and firion both best atk skill is only 1 hit, which heavily rely on other character's chain to maximize damage... as for chain atker, it will be veritas of darkness, onion knight, 2B, agrais and so on...

for debuffer, WoL, 9S and veritas of darkness(impact) would be nice cuz they got above 45% stat debuff

the TMR u should focus on is should be those with special feature like 9S (8 hit chain-able atk, 40% physical dmg reduction, hp regen) or dual wield from zidane, dual cast)

WoL will shine again once skill awakening enabled

other than high atk weapon, u should also give priority to elemental weapon first to non elemental weapon for cheap dmg boost on unit like fohlen, aileen, VoD, orlandeau, agrias lol... because later on the trials will be more focus on element chain and magic atk d... but these are based on jp server reference since i only play on jp server

same thing happens when sephiroth and squall released in japan...

best magic tank and status resist...

in JP they released a male version of mystea, skill everything completely the same...

she will be the best unit to tank bahamut magic attack

so u got one confirmed super trust master in future ady