Hello,

I am currently texturing my orc in Mari.
Planed to build shader for that later in Houdini or Maya
I always wanted to build VFX effect on top of the model.
Idea was that some areas of skinn will burn away and reveal flesh below it.
Am i correct to think that then i need textures for skinn shader and then separate texture and shader for flesh?
And not to texture both in to same texture map?

I am concerned about the corner area when skinn has burned away. That small gap betwean skinn and flesh after burn has taken a place.

That's one way (and very valid)
You could also have the burn be a mask to a second texture including a displacement that pushes it inward.
Both are doable, with pros/cons. I tend towards the displacement technique, but no experience in mantra.