- Master Therion (マスターテリオンMasutā Terion?)
- Voiced by: Hikaru Midorikawa (anime), Hikaru (PC)
- Current head of the Black Lodge and titled as Grandmaster, this youth with a contemptuous, bored expression cares little about those who cannot match his vast, mystical power, thus allows Kurou to survive their many scuffles so as to provide him a challenge and amusement. Master Therion also controls the Deus Machina Liber Legis.
- He is the child of Nero, "the greatest and most wicked magician in the world," and the Outer God Yog-Sothoth.