Magus

Magus is a villain of The Avengers and the henchmen of Thanos. He appeared in Avengers: Infinity War, Captain Marvel and Avengers 4???.

Avengers: Infinity War
To be added

Captain Marvel
Magus wanted to calm down Thanos but that didn't succeeded. Thanos said that he will attack them and kill them all.

Avengers 4???
To be added

Allies

 * Thanos - Boss

Enemies

 * The Avengers