Psychotic Jim
First Post
One option may be to use the Incantation rules (from the 3.x Unearthed Arcana) but give them a divine origin. Instead of arcane words of power, rather, they're prayers and recitations to curry the gods' favor. Just make most of the checks Knowledge (religion) instead of Knowledge (arcana). In this set up, clerics could be experts at quickly channeling the power of their deity whereas less dedicated but still faithful characters (ie, non-divine casters) could use the Incantation rules.