Horn of the Goblin King: hold item, held when Uluating.
Purpose to call forth mounts with a higher level than the average, 0r whatever you'd chose to do. A giant swamp or a unique mount for who ever holds the legendary horn might be entertaining.

Spurs of the War Rider: Boots with heavy weight to aid with stomping whenever, with nerfed spiked-toed boot like qualities for kicking, but only while mounted.

Explosive arrow: A arrow tipped with a satchel of goblin powder attached, bow must be equipped to use syntax: Use explosive. Arrow
does decent fire damage with a concussive blast that has a chance
to stun as well as damage to the raider firing the arrow due to proximity required to fire the heavy projectile.

Spine of the Great Warg: Spear with a extra attack while mounted. Something like a retaliation for trying to bash or something of the same nature that leaves something nasty like poison or bleeding due to the aided weight of the mount behind it.