The Diablo Stone item summons and dismisses a Mini Diablo, a demon Companion that follows you around, meaning it is a non-combat pet and will not aid you in battle.
You can obtain this pet by opening your gift box item (that you receive in the mail) and accepting the quest which requires you to turn in the gift item to an NPC in exchange for a choice of three pet items, one of which is the Diablo Stone. The name of the gift box, NPC and quest zone is different depending on your chosen race.
- Merissa Stilwell at Goldshire for Humans
- Yori Crackhelm at Kharanos for Dwarves and Gnomes
- Orenthil Whisperwind at Dolanaar for Night Elves
- Jaeleil at Azure Watch for Draenei
- Magga in the Razor Hill for Orcs and Trolls
- Vorn Skyseer at Bloodhoof Village for Tauren
- Claire Willower at Brill for Undead
- Marsilla Dawnstar at the Falconwing Square for Blood Elves
The Mini Diablo is inspired by the title villain of Blizzard's Diablo series of games (the name is literal; it's a very tiny version of the Lord of Terror). As its idle animation, it will occasionally breathe fire.