Xenocrates Bastier

Xenocrates Bastier is a Possessor Demon, and the most powerful of his kind. Able to enter and control individuals at will, he is a formidable foe. He wishes to gain enough power to overthrow the Master of the Underworld, and will use and manipulate anyone in order to achieve this goal. Recently, Xenocrates dominated a clan of imps by forging an alliance with their Imp Master, Valdamar. However, Valdamar secretly wished to vanquish him and restore himself to power, and tried to steal a Book of Shadows in order to obtain enough power.

Vanquish
It is impossible to vanquish Xenocrates while he is is possession of an actual, physical body. However, his essence can be contained using magic.