Leonas flexed his forearms and the bindings creaked as his muscles swelled and stretched them wide. He tugged at the holding straps. One hand burst free and then the other. Roboute’s face expressed a moment of boggle-eyed surprise as Leonas reached across and caught him by the throat.

The neck was so thin it was easy to snap.

‘I told you,’ Leonas said, dropping the dead body to the floor. ‘I cannot die'.
...
	The tau guards had no idea what was coming for them. They ducked behind the bulkheads and stared in horror at the naked torso of the Space Marine, hammering the plexiglass screen, leaving bloody smears against the pane. The roar of battle came closer, and ice began to craze the monitor screens before them. One of the fire warriors tried to open the door to shoot. As he fumbled with the lock the door burst from its hinges and the Space Marine ripped the carbine from him

Leonas fumbled with the mechanism for a moment, before giving up and smashing the guard in the face with the butt of the gun. By the time the others fought their way to him, Leonas stood in a room of the dead.

Storm of Damocles