Peacemaker is a Mind Control type Sigil currently used by Ayanokouji.
Capabilities
Not much is known of its capabilities other than its sole seen use of erasing one's memories.
Plot
Ayanokouji is first seen using Peacemaker when he is confronted by D-Game enforcers, who had come to take him away, as the police force seems to not be allowed to know about the D-Game.
He uses it to erase their memory of seeing him, so he can successfully escape them.