[@Polybius] 

I'm not sure that having Gods physically existing in the world will be beneficial. Perhaps if there was a mothership-esque giant fungi, which gives life to other fungi whilst simultaneously looking to decay the environment to its advantage, deconstructing the trees and lifeforms until it can feed or alter them to serve its will. This giant Shroom may be the conduit for a god of decay, at its core lies the ancient shrine to its benefactor, whom grows in power as its parasitic minions spread their taint.

Thoughts?