Take this guy:



Clip off the branches - turn them into sharp edges/points.

Assemble him using the antlers from the Treeman Ancient and the face from the Treeman. Paint the 'internal' parts of to look like they're hot, paint the 'bark' to look like iron or metal that's blackened from the heat. Job done.

I suppose you could adapt him by giving him a Wraithknight sword and a GS loincloth.

What do we think?