Cults

The Chaos Cult -

The god's seperation is temporary.  He will tear the world apart and built a new one from its rubble.  He will reform and reward those who helped him return by turning them into the new pantheon of the world in his image. 

Icons -

The cult uses many mystical icons in it's ceremonies.  

Skulls represent what remains after the force of chaos is done with our bodies.  It's our perfect form in his eyes.

Black and red robes represent the darkness he was spanwed from and the fire to which he burns in now.

Magic -

The rituals cast by the cultists are twisted to pull power that was not rightfully given by their gods.  Outwardly this seems to drive cultists insane.  Those who have cast the spells, however, say that they're not mad, they've just gained insight into the will of the gods.