SRD
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Demons usually walk. Grol shouldn't stand out from the crowd.
Added 6 minutes ago
Regarding Grol, maybe we could base him on (skeleton and animation) a Barbarian hero? Replace the head with Agrael's helmet, recolored to black; recolor the axe to black or change it to another one, so it looks like the axe from the artwork; as for what to do with the bull, I don't know, but I can suggest the following options: try to put the hero on, for example, a hell steed/nether horse or a hell hound/fire hound as an effect if it's not possible to fully attach it to the bull's skeleton. Another option is to make the bull look like a hellhound from Warcraft III.
Added 5 minutes ago
If you really want the demon to walk, you can use the standard demon model as a base, but replace the head with Agrael's head instead of the standard one, but it will turn out to be a thick model with a small head - I don't think it will be concise - the standard demon, in my opinion, is very clumsy - it's too thick and the armor is very bulky.
... И древний лес, роскошен и печален,
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...