valaaia:

I wondered what mount DK!Garrosh would use.

Of course, the first thing that comes to mind would be an undead worg. 
But that seems too much a symbol of Thrall’s Horde.

So I thought a creature native to Draenor would be better, a lingering connection to “home” even in undeath. Thus, the Talbuk.

(I looked up a goat’s skeleton to get some bone refs, but the Talbuk itself I drew from memory – so this stays a WIP for now.)