just for AOE :
Cocoon ==> dmg mitigation
Yawn ==> light aoe sleep
Magic Hammer ==> dmg into MP (only works on monster that have mp, iirc doesnt work on undead)
Battery Charge ==> refresh (+3 mp/tick. usefull but not really mandatory)
Whirl of Rage ==> aoe physical stun (usfull but not mandatory)
Dream Flower ==> for aoe sleep
Occultation ==> shadows to take out a few hits
Barrier Tusk ==> dmg mitigation
Molting Plumage ==> DW
Glutinous Dart ==> if you got point to spare (will complete HP bonus with barrier tusk)
Carcharian Verve ==> very potent Aquaveil
Erratic Flutter ==> haste II and FC trait
Subduction ==> very cheap and potent aoe wind+gravity nuke
Blinding Fulgor ==> aoe dmg + flash (if you got point to spare, light side if considering dynamis D)
Spectral Floe ==> mab trait + aoe dmg + terror
Anvil Lightning ==> aoe dmg + stun (light side if considering dynamis D)
Entomb ==> aoe dmg + petrify
Tenebral Crush ==> aoe + macc trait
Mighty Guard ==> haste +regen +defence
cant take it all in iirc but you can adjust from this list depending on your need.
carcharian verve being one of the key spell for aoe nukes as ther is nothign worse than being interrupted while casting ^^
one more point :
subjob jobtrait do NOT add up with jobtrait from spell. whichever is the higest will takeover.
meaning blu/rdm will not benefit from rdm FC or mab jobtrait if they already have mab or FC at 3+ from their spells.
at that point it might be better to pick up a defensive subjob or one that gives yuo trait your spell do not give. also consider the spell you get from your subjob and the MP pool/stat increase.