Dreamslayer

Dreamslayer is a supervillain appearing in comic books published by DC Comics. He is part of the Extremists, a villainous group whose members are all based on an existing Marvel Comics villain. In Dreamslayer's case, he is based on the villain Dormammu. Dreamslayer first appeared in Justice League Europe #15 (June 1990), and was created by Keith Giffen, Gerard Jones and Bart Sears.

Dreamslayer is a member of the Extremists and worked with them to kill most people on Angor, their home planet. He travels to Earth with the four surviving humans of his world: Mitch Wacky, Wandjina, Silver Sorceress and Blue Jay. Dreamslayer kidnaps Wacky, then forces him to create robotic replicas of his comrades. Wacky is forced to work around the clock on the robots; in the end, he is only able to create a robot version of Lord Havok due to limited supplies. Dreamslayer kills Wacky as soon as Havok is functional.

The Silver Sorceress attacks the island, along with her Justice League comrades. The natives of the island, mentally controlled by Dreamslayer, attack. The League's desire to not hurt the natives costs the Sorceress her life, as she is hit with an arrow in the stomach. Before dying, she neutralizes Dreamslayer in a mystical battle. Dreamslayer has returned more than once, to plague Supergirl and the Justice League. He was used and tricked by the villain Overmaster.

Dreamslayer is a supernatural being or powerful sorcerer whose magic is drawn from the dimension of terrors which he rules over. He has superhuman strength and endurance, immunity to physical and energy attacks, can fly, project flame, teleport, read minds, communicate with telepathy, and manipulate matter. He is a wraith-like being who is unlikely to be killed by conventional means, even surviving the nuclear event on Angor. When taking over a person's body, he can supercharge any metahuman abilities they have.

The Earth-8 version of Dreamslayer has the same magical abilities, including the power to freeze a whole city in time.