Tagar Spinebreaker

Tagar Spinebreaker is the leader of the cannibalistic Bonechewer Clan.

Background
He rose to power shortly before the invasion of Draenor, after Grom Hellscream killed the former chieftain, Hurkan Skullsplinter for the Skull of Gul'dan. Whether he was next in line for the chieftainship or simply took the opportunity to step up is unknown. Tagar garbs himself in the innards of his enemies; that which he does not devour himself. His belt was fashioned from orc spines and bracers carved from the spine segments of an ogre. Tagar is ruthless and bloodthirsty, craving only the heat of battle above all else. The Bonechewers stayed in Draenor during the First Crossing, but when the Second Crossing was imminent, the Bonechewers were brought into line and used against the Alliance. Tagar Spinebreaker personally accompanied Fenris the Hunter to the Tomb of Sargeras where they claimed the Jeweled Scepter of Sargeras for Ner'zhul.

World of Warcraft: The Burning Crusade
Tagar Spinebreaker is now a fel orc, and is likely still the chieftain of his clan. He can be found roaming the hills near the Path of Glory in Hellfire Peninsula, with the surviving warriors of the Bonechewers.

It is possible that Tagar Spinebreaker is related to Krun Spinebreaker, a vision of whom can be seen during the Alliance quest.

Behind the scenes
In the original Warcraft II: Beyond the Dark Portal manual, Tagar is mentioned as the chieftain of the Bonechewer Clan. Beyond the Dark Portal retcons him into the successor of Hurkan Skullsplinter.