Ultima.
Can't be blocked, can't be dodged, and does around the neighborhood of 9999 damage. (Except for Final Fantasy II, where the spell's virtually useless until you pump it up.)
Holy
Flare
Ultima
Meteor
Full Life
Aura
Haste(ga)
Shell/Protect
Curaga
Reflect
Death/Break
Other
Ultima.
Can't be blocked, can't be dodged, and does around the neighborhood of 9999 damage. (Except for Final Fantasy II, where the spell's virtually useless until you pump it up.)