Scar

Scar was a lion who originally possessed the Roar of the Elders.

History
It has been confirmed that Scar's history as leader of the Lion Guard. This power went to his head, and he wanted to use the Lion Guard to help take down his brother, Mufasa. However, when he refused, Scar destroyed him using the Roar of the Elders, and as a result, Scar became weakened by this event.