Summon forth your lone hellhound, void-spawned aberration loyal to none save you and yours.
Having survived, alone, the hellish darkness that is the void, this demonic beast will not soon suffer the presence of others, choosing typically to attack before he himself becomes a victim. Which is why it is all the more surprising that the hound would allow someone on his back.
How to obtain:
PvP -- The Feast: Season 3