What is dormammu?

Dormammu is a fictional character and a powerful supervillain in the Marvel Comics universe. Created by writer Stan Lee and artist Steve Ditko, Dormammu made his first appearance in Strange Tales #126 in 1964. Dormammu is the ruler of the Dark Dimension, a universe adjacent to our own. He possesses immense magical powers and is capable of manipulating reality to suit his desires. Dormammu is considered to be one of the most dangerous and powerful villains in the Marvel Universe, and has clashed with numerous superheroes, including Doctor Strange and the Avengers. He has been portrayed in various animated series and video games, and was also featured in the 2016 Marvel Cinematic Universe film Doctor Strange.