Experience and Spell Progression
It would be possible to come up with an Experience Levels Chart and Spell
Progression Chart for every priesthood of specific mythoi, but it would also be
crazy; there's no reason to have the extra complication in your campaign.
All new priesthoods introduced in the next chapter use the Cleric experience
progression and the basic Priest spell progression, both from page 33 of the Player's Handbook. If your DM, when creating a new priesthood, decides that it is observably
less powerful than the Cleric or the priesthoods written here, he can choose to
use the Druid experience progression, which allows for faster acquisition of
experience levels.
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