Lucubra

Lucubra is the main villain of the episode The Creature From Beyond. He might be the main villain in the Ben 10: Ultimate Alien Season 2 arc.

Physical Appearance
Lucubra is a demon from another dimension sealed by the first Forever knight.It has a green and gray body that resembles an amphibian or some kind of a lizard. It can't talk but it's victims can hear it's thoughts. Also, it feeds on human thoughts, possibly other species who are sapient, and it can control minds.

Powers and Abilities
Lucubra is a powerful demon with the ability to feed on the thoughts of humans, and possibly other aliens, through his tentacles. Gwen states that he feeds on the part of the mind used to pray or meditate until there is nothing left of the victim's mind. The victim then becomes his obedient servant, evident by the green eyes. Lucubra is also very durable, able to withstand repeated attacks from Ben and Kevin while taking little to no bodily damage. He is also strong enough to knock one of the knights away with little effort, and can fire a laser from his face.

Weakness
He can take over sapient beings but if their cranium is protected by the right type of metals or something similar in hardness and toughness, he cannot control them nor can his tentacles reach their victim.

Known Victims

 * Gwen Tennyson
 * Unnamed Officer
 * Unnamed Forever Knight
 * Unnamed Forever Knight
 * Winston

Ben 10: Ultimate Alien

 * The Creature From Beyond

Trivia

 * If you look closely, his body and tentacle is similiar to AmpFibian's, creature in episode Paradox and Wildmutt's body.
 * Unlike other villians that are powerfull aliens, Lucubra is the first actual supernatural being that Ben's team faced so far.