|Debut||January 18, 2010|
|Known ability||Control over shadows|
|Formal name||Cyrus Karr|
|Home||Los Angeles, CA|
When his father mysteriously died when he was 17, Cyrus was taken in by a local gang called Eclipse. During a fight with a rival gang, he discovered his ability. He rose through the ranks of the gang until he became its leader, and revealed his ability to them. He now attempts to turn the gang into a force to protect people, while also investigating his father's death.
In chapter 3 of Purpose, John Mulligan calls Darkmoon after an encounter with The Watcher. He calls him Cyrus and asks if he should team up with The Watcher. Darkmoon insists that he cannot call him Cyrus and goes on to say that teaming up with The Watcher is a bad idea. John calls him Cyrus again and Darkmoon angrily says that only his mother can call him that.
- The character of Darkmoon was chosen from the top-ranked characters in the Heroes: Survival game to appear in an iStory.
- Darkmoon is a member of The Guardians in the Heroes: Survival game. This is the same faction that John Mulligan belonged to.