Grimoire

From Herocopia

Grimoire was the assistant of the great sorceror Simon Magus. Her body was tattooed all over with spells written in a foreign script, and she can be thought of as his living spellbook or his magical battery. To charge himself, the two would perform a mystic, sexual ritual.

Years after her association with Magus, she wrote a book revealing how she was the true source of his power.