Do priests ever level up?

[Manuk]

They don't get more priests lvl by experience.

When you make a commander your prophet it become priest lvl3, or if it already has lvl3 or more gains +1.

There's a sword, mmm sword of justice i think that gives +1 and there's a sword of injustice.

[Nick_K]

There's a thread somewhere which gives the benefits of experience at each level. Spellcasters don't improve their magic abilities with experience though, although research does increase.