Concept doodles, this is the raptor mount that belongs to Zul'dar.
Yes, the armor is not something you'd expect to see on a troll mount(but I will, of course, make it more troll-ish, this is just a rough sketch), or on any Horde mount except, Blood elves or Forsaken, maybe. But that's because Zul'dar has a shitty personality, very arrogant and boastful. He was one of the commanders in the Horde's army, and he really liked to show off both his status, as well as his power as a shaman|shadow hunter, so it showed in his choice of armor and garments.
It also probably has something to do with the fact that he isn't really a Darkspear troll, he's a Zandalari(or a Zandalari|unknown jungle troll mix, he never said anything about his lineage), who seemingly left Zandalar for some reasons.
When he left the Horde, he left his raptor in Sen'jin village. His tauren friend Maiara made sure that nothing would happen with the raptor, as she hoped that the shaman will one day return.
Blah. I still can't figure out if I want the dino to look more like RAPTORS, or have something in common with allosauridae. We'll see.