Plum Mordosié

Plum Mordosié is a magician who was making use of a shared ceremonial ground hidden in a container yard in 's harbor district.

Background
Within the month before the Hood summoning incident, they made use of the shared ceremonial ground run by Jack Prometeria, unknowingly becoming part of the summoning ceremony which Jack intended to use to summon the ship.

Toaru Majutsu no Index SS: Agnese's Magic Side Work Experience
As the phantom was approaching Calais, they were captured by Anglican agents and brought to the container yard for interrogation by Agnese Sanctis along with the other magicians who had used the shipping container in which the summoning ceremony was performed. Answering truthfully about what they were doing, none of them knew the required exorcism procedure as they were not aware of being part of the summoning ceremony to begin with.