|Black Soul Gem|
750 with a Grand Soul
A Black Soul Gem is a special type of Soul Gem that can capture the souls of humanoid mobs and Ghosts. They are as powerful as Grand Soul Gems, and can also capture lesser souls. These can often be found in dungeons with necromancers, the College of Winterhold quests, they are also sold by Enthir in the College of Winterhold and Falion in Morthal.
Additionally, Black Soul Gems are used in a number of Atronach Forge Recipes.