Seuthion

Guardian of the Gate to the Void. He has no discernible shape, as seen in Sibella’s interactions with him, where he appears as a mass of black energy with red eyes. It is his duty to ensure that souls properly enter the Void and that they exit it once they are selected for reincarnation, which is usually done at random.

When speaking to others, he very seldom uses names, calling them by title or lineage instead. For example, he calls Sibella “Death Mother” or “Matriarch,” and has only ever called her by name once.