Bless you!

Small houserule I came up with while redoing the my xp awards for my campaign:

Attending a church service/religious ceremony of a friendly faith and tithing appropriately to their stature (at least 50gp) gives 50 xp.

It also has a chance of bestowing a blessing. The character tithing needs to roll Save vs. Spell to gain the effects of a Bless spell until the next combat or rest period (whatever happens first).

A critical failure on this roll (1 in 20) instead gains them the effect of a Quest. The PC in question now is taken with the unbearable need to do something specific (ideally something related to the saint/deity worshipped in the temple).

Mind you, you might think this is just a boon for player characters, but the effect of this can also affect opponents, be they clerics, cultists, or members of various tribes. There is a chance any particular group is under the influence of a Bless spell, as long as there is a cleric or shaman attending their spiritual needs.

This also means the local tribes might send out representatives on Quests themselves. An orcish tribe might get the quest to locate a legendary weapon of their tribe now in the hands of the local baron.