Colleen Messala served as a mage under contract to Lord Villar Constance during the Atlatan continent's political and military conflicts. Her magical abilities focused on manipulating energy to influence phenomena and combat Chaos manifestations. During the defense of Castle Unicorn against the invading forces of Marrine Kreische and her allies, Colleen participated in the battle. She deployed a massive, mirror-like construct in a large-scale magical attack, directing laser-like beams against enemy naval vessels—an action she later regretted, apologizing for its destructive impact.

Her personality was characterized by gentleness and compassion, marked by kindness and emotional sensitivity. This nature made her seem ill-suited for the brutal realities of war. In her final moments, disarmed and isolated, Colleen confronted Ururika, a commander of the invading Nordic forces. Visibly distraught, she sat slumped against a wall, eyes closed and crying. Offering no resistance and posing no threat, she was killed by Ururika. Her death contributed to the fall of Villar Constance's faction.