The Diablo Stone item summons and dismisses a Mini Diablo, a demon small pet 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 and accepting the quest Welcome! 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 Northshire Abbey for Humans
- Yori Crackhelm at Anvilmar for Dwarves and Gnomes
- Orenthil Whisperwind at Shadowglen for Night Elves
- Jaeleil at Ammen Vale for Draenei
- Magga in the Valley of Trials for Orcs and Trolls
- Vorn Skyseer at Camp Narache for Tauren
- Claire Willower at Deathknell for Undead
- Marsilla Dawnstar at the Sunspire for Blood Elves
The Mini Diablo is inspired by the title villian of Blizzard's Diablo series of games (the name is literal; it's a tiny version of the Lord of Terror). As its idle animation, it will occasionally breathe fire.