"I will grind your bones to make my bread!"
Thag Slabhead is a huge ogre that Hulgen Proudfist has asked you to slay for the quest Test of Strength. He will only appear in the specific location if you have the quest. His powers are the same as the normal Savage ogre.
Like the normal Savage, Thag Slabhead has three at-will powers. If you stand still he will attempt to use Crush or Grand Slam; both of which take a moment to deploy and are easily avoided after the Savage begins the attack. If you are moving when the Savage attacks he will use the Melee Attack power.