"If you're a true Summoner, then the mission should be your priority! Our rescue should only come after that!!" — Seria, Karl's recitation of Seria's quote when attaining the rank of "Phoebus". Seria is a summoner of the Akras Summoner's Hall who is the head of the 19th Demon Slayers Divison, "Bloody Rose". She is initially introduced in a secondary tutorial of the game, then re-enters the story in Morgan. She is known to be constantly aggressive, often picking fights with other characters seemi