Tiamat

ティアマトー

aka 夢幻の冠帯, Crown-and-Sash of Fantasies

The female Crimson Lord to whom Wilhelmina is bound. She is described by her own Flame Haze as a most unsociable entity; she is taciturn and to the point, saying nothing more than what is necessary, usually in a monotone, portraying no emotion regardless of the situation.