Klorgbane the Destroyer

Klorgbane the Destroyer was first seen in the "Fists of Justice." He was the main antagonist and he is related to the Guardians of Eternal Youth, as their "evil brother." He has to fight Skips every 157 years. His main goal is to defeat Skips, and reign over the Realm as part of the council. He fought Skips for a while, and was ultimately beating him, until he lost to Mordecai and Rigby shortly afterwards.