Strahd's Frightful Joining

Strahd's Frightful Joining is a spell created by Strahd Von Zarovich. The spell allows an undead caster to merge its mind with that of a living victim. For the duration of the spell, the caster lies inert and the caster's mind controls the victim. At the end of the spell, the victim is usually driven mad.

This would seem similar to the spell that Strahd used to inhabit Auric's body while touring Forlorn, except that Strahd's Frightful Joining is limited in range by domain borders.

Data from the Ravenloft Catalogue

		Domains of Dread Forbidden Lore: Nova Arcanum
		Domains of Dread - p194 Ravenloft Campaign Setting:Realm of Terror - p101 Forbidden Lore: Nova Arcanum - p26
		Domains of Dread - p194 Ravenloft Campaign Setting:Realm of Terror - pp101-102 Forbidden Lore: Nova Arcanum - p26