Why Do Deities Use Mortals?
Deities use mortals because they need them.
Depending on how you define deities in your game, deities may need mortals because the actions of mortals provide power, or because something bars the deities from acting on the Material Plane.
If your deities depend on mortals for their power, assume that only actions undertaken by mortals of their own free will provide this power.
Such power stems not only from worship, but from all sorts of actions.
The amount of power generated by such actions is in direct proportion to the effort and sacrifice required by the action.
Considering the risk taken and the effort made routinely by adventurers, it’s obvious why they’re important to your deities.
In such cases, the deities may send signs and avatars to encourage their worshipers, or they may appear themselves.
Your deities may not act directly in the mortal realm.
Some barrier may exist to keep them from the Material Plane.
Alternatively, your deities may have an agreement to strictly limit their direct intercession on the Material Plane.
Such deities need mortals to perform those tasks the deities cannot.
They may need heroes to inspire worshipers, or they may need artifacts recovered or spells cast.
They may need mortals to interfere with the churches of rival deities.
In such cases, the actions of mortals reflect and influence the relationships of the deities and determine divine power.
