Alastor (NS)

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Alastor (アラストール) is the Crimson God "Flame of Heaven" who is contracted to Shana.

Vessel
In his sealed form, he expresses his will through a divine vessel called Cocytus, which takes the form of a pendant when he is under Shana's contract and a hand accessory in Mathilde's case, both forms sharing a pitch-black gem.

True Form
Alastor's true form is a massive creature with powerful limbs and horns that resembles a Minotaur. He has large wings with membranes the color of the night sky and burning eyes. He is completely covered in flames which are powerful enough to incinerate everything in his path. A black mass is hidden inside those flames