[kia345]

Zodiac's classes are based on a flavor of the month. If the powers that be like dark knights, then new scythes and powers get released. If they like assassins, then they get OP'd out the ass. When they decide thieves are cooler, they become better physical fighters than the 'sins.

Just wait for them to decide priests are cool. Seeing as there's no jrpg with priests taking a cool role, or no anime with healers getting the cat-eared girl, I don't expect anyone on Zodiac to acknowledge priests' existence.