He looks to be wearing some sort of symbols that refer to Braccus Rex, a tyrant king. Maybe this is a whickerman situation where the locals celebrate the death of Braccus Rex with a love sacrifice dressed as one?

A kind of flower, cant remember the name… Blood rose? But it’s a demonic type of flower that only grows in soil that has been tainted with extreme suffering. Might have something to do with the Void…?

Probably some sort of Void curroption, I would recon. DOSII literally had people and creatures boiling, then exploding, into Void creatures.

Yes.