Kirin Tor Familiar
Binds when picked up
Use: Teaches you how to summon this companion.
Hovers about and occasionally produces a non-damaging Arcane Explosion.
Simply speak to Archmage Vargoth to receive this pet. Vargoth is housed in a secluded spire atop the Violet Citadel within Dalaran. In order to access Vargoth, one must teleport to his location using a tome rewarded by the "Higher Learning" achievement. This achievement entails reading 8 different books about arcane magic that spawn throughout Dalaran. The books appear to be on 3 hour spawn timers and share spawn points with roughly 30 other non-achievement books. Read the Kirin Tor Familiar Guide for the most efficient method to collect this pet.
Note that while a warlock and two others who have access to Vargoth can summon another player to his location, that player cannot receive the pet without having completed the achievement.
OK, this guy's beginning to get a little too "familiar" with me. He's always invading my personal space! And when he doesn't get what he wants, he throws a tantrum and spams Arcane Explosion. Now that I think about it, maybe all entities summoned from the Twisting Nether are behavioral. For example, my warlock friend's Voidwalker is always demanding that she "send him back" (which is really starting to erode her self esteem). Meanwhile, her succubus is busy slapping her own behind and trying to seduce anything that moves. And don't even get me started on her emotionally abusive felguard...