Atal'alarion
These trolls are much larger and more fearsome than their smaller brothers and sisters. They are very rare, and found deep in Troll territories such as the Sunken Temple and Zul'Gurub. Dire Trolls may be enchanted, cursed or just natural. They have many roles. For the Atal'ai of the Sunken Temple, they are Warriors, as well as Atal'alarion ([1]), who seems to be a huge, guardian troll of a statue. He is summoned, which suggests he is not natural. Among the Zandalar Tribe, Jin'rokh the Breaker appears to be a popular figure among them. The Gurubashi Berserkers of Zul'Gurub are also Dire Trolls.
Possibly the most powerful Dire Troll was Korrak the Bloodrager ([2]). Not much is known about him. He resided in Alterac Valley with a species of Dark Trolls or Ice Trolls. His skin is red, and he stroke even the most powerful heroes down in one blow. As of patch 1.10, Korrak, and his band of trolls have left the valley.