Strongest class/job lore wise?

[Waliel]

Holy - 200 potency AoE that diminishes with each target hit
Flare - 260 potency AoE that didn't originally diminish, but now does
DEATH Flare - 400 potency AoE that does not diminish at all

If you really wanna go that route, Flare is 468 potency and Fire 4 is 504 potency when you ever use them.