The shrine itself would make a nice terrain piece. The mutant things, not sure....possibly a great convert for a Pallanquin of Nurgle for a Nurgle Chaos Lord. The dude on top? Oh...he'd make a right awesome cultist champion. Seriously paint that guy up and stick him in with the horde of cultists...he'd be amazing.
As for the chariot....beats me? The lord guy would make a pretty descent lord, or even a sorcerer. Not sure what else to tell you. Hope it helps.