Phantaminum

Phantaminum (펜타미넘, Pentamineom) is a mysterious and highly dangerous Irregular, currently ranked 1st in the Tower. He is infamous for contributing to the creation of the stereotype against Irregulars. He is presumably the most powerful entity in the Tower and is actually an Axis (Reality Editor). Known as the "Riddle", he is the most enigmatic entity in the Tower: no clear motives, no clear relationships.