|Klorgbane the Destroyer|
|Relatives:||The Guardians of Eternal Youth|
|Appears in:||"Fists of Justice"|
Klorgbane the Destroyer was first seen in "Fists of Justice" as the main antagonist. He is related to The Guardians of Eternal Youth as their "evil brother." He has not been seen in any other episodes. 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.
He looks similar to the The Guardians of Eternal Youth, except his clothes are black (opposed to theirs being gold), and his body is more muscular in appearance. He wears a black helmet or hat, a black and red cape, a black diaper, black socks, and two sliver/black bracelets. He also has a red glow around him and carries a red rattle with spikes on it as a weapon.
- Like The Hammer, The Destroyer of Worlds,and the Guardian of Secrets, he is one of the most powerful characters and/or enemies in the series.
- The Fists of Justice is the only weapon that can defeat him.
- He killed one of the Guardians of Eternal Youth, Archibald.
- Klorgbane is similar to the Green Lantern character, Krona, who was once a Guardian of the Universe (being's who the Guardians of Eternal Youth are possibly a parody of) until he betrayed his brothers and became evil.