Evil Guy

The Dark Magician is an evil being that appeared in the episode "The Enchiridion!." He introduces two final challenges for Finn and is destroyed in the process.

Plot
After rescuing Jake from the Ogre in "The Enchiridion!," Finn enters a dark hall, where he meets the Dark Magician. As a final trial, Finn is summoned into the Magician's "Brain World," where he must destroy the Heart Beast. After Finn defeats the beast with a flurry of punches to the top of its torso, the Magician orders that, as "one last, last trial," Finn must slay an unaligned ant. However, because the ant is not evil, Finn refuses to slay it. Instead, Finn exits the Magician's Brain World, sprints toward him while screaming "NEVER," and kicks him in the crotch which causes the Dark Magician to evaporate into a red cloud of smoke, presumably vanquishing him.

Appearance
The Magician's appearance is that of a scythe-less reaper with glowing red eyes and sharp teeth. He wears a tattered, gray cloak coated with a green, mossy substance. The Magician has pale, bony hands as well as gangling arms. As Finn demonstrates, a kick to the "nards" is capable of vanquishing him. It is possible that the Magician could be based on the Grim Reaper, an entity who personifies death.

Trivia

 * This was Mark Hamills first apperance in a popular show or movie,outside of the StarWars Series.

Quotes
"Congratulations, Finn the human! You must be truly righteous enough to get THIS far!"

"Now, enter my brain world, and I will show you some aspect of yourself that you're not entirely aware of."

"You've done well, hero. Now, as one last, LAST trial, SLAY THIS ANT! If you want the hero's Enchiridion, then slay this unaligned ant!"