The Lich

The Lich's powers and abilities

Aside from his immortality, the Lich has a medley of unholy powers. The most commonly used is his ability to summon green flame-like energy around his hands and fire it at his opponents. Also, while possessing Princess Bubblegum, he demonstrates pyrokinesis when he sets her room on fire with his mind.

The Lich also seems to exude an aura of death and rot around him. Whether this is done consciously is unknown, but living creatures and objects have been seen to rot and die as they come in contact with him or his general presence. This is shown when trees died as the Lich passed through a forest, and when he crossed Iceberg Lake, fish died in his path. In addition, the Lich can breathe a black, life-sucking gas, which he used to kill Prismo.

Adding onto his array of deadly magic, it was revealed that the Lich has the power to control people's minds, either through telepathy or spoken commands. His most notable spoken ability is to say the word "stop," where he takes his victims to another, a night-like plane in which he has full control over everything. The Lich's influence was so great that he posed a threat to anyone nearby, even while he was still trapped in the Candy Castle. Moreover, he has the ability to possess other people, as seen when he possessed Princess Bubblegum. It is apparent that the Lich's consciousness is able to reach across multiple dimensions, based on his Farmworld self having knowledge of events involving the Lich of the standard timeline. The Lich is also able to utilize necromancy, as seen when he controls the corpses in his lair to attack Finn and Jake. In an Adventure Time comic, the Lich creates his own world and makes Finn, Jake, and Ice King believe that they are getting rid of him, but he is actually just playing another mind game. Alternatively, in "Escape from the Citadel," the Lich can set the Citadel on black fire and cause a plague between beings, which he possesses to destroy the Citadel and its guardians.

The Lich also possesses great physical abilities as he was able to quickly dodge Finn's energy attack with Billy's gauntlet. Later, he easily caught Finn's punch barehanded and shattered the gauntlet into pieces. In addition, the Lich is also very mobile as he possesses the ability to fly.

The Lich sustains his massive strength by drinking from his Well of Power, a noxious, magic pool of glowing green liquid located in the depths of his lair. After he had possessed Princess Bubblegum, he substituted the contents of his original well with a mixture of toxic chemicals such as gasoline, lighter fluid, bleach, and plutonium that he (appearing as the Princess) ordered Finn to retrieve.

While his power is truly a force to be reckoned with, the Lich has a few known vulnerabilities. His main weakness is the Gauntlet of the Hero, a magical weapon previously owned by Billy that fires intense energy blasts. This weakness is now moot as the Lich destroyed the gauntlet with ease when he grabbed Finn's arm and caused the gauntlet to disintegrate. Another item able to work against the Lich is the sweater Princess Bubblegum gave to Finn. Imbued with the power of "liking someone a lot," a.k.a love, the sweater protected Finn from the Lich's flames and was later used as a weapon. With it, Finn was able to attack the Lich by assaulting his head and eye sockets with the sweater, causing his body to collapse into dust and force his essence to have to find a new host. However, the sweater does not seem to affect the Lich when he is possessing Princess Bubblegum. The Lich is also unable to control a person's mind if he/she is wearing a certain type of magical jewelry. While generally impervious to physical attack, traditional methods may have some limited effect on the Lich, as seen in the flashback where Billy cast him down with a kick to the face.

As Sweet P, the Lich appears to be immune to elemental magic (fire, ice, candy, and slime).