Avatar
From Ardrana
When a deity has business upon the Prime Material Plane, he must send an avatar. An avatar is simply a manifestation of the deity upon the Prime. This manifestation is not nearly as powerful as the deity himself, and is merely a projection of the deity's power.
Unlike the deity itself, an avatar can be destroyed, which is never looked upon kindly by the true deity, and often results in some sort of divine retribution. Although avatars may take many different forms, the number that can be created and the frequency with which they may be replaced depends upon the deity's stature.
Note: Avatars originally appeared in this form in Legends & Lore for the AD&D game from TSR. The use of the concept here is for the purposes of providing context for the campaign only.