Azura's Star is obtained at the end of the quest titled The Black Star, and may be obtained in one of two ways. Black souls are always detailed as the largest type of soul, a grand soul, but seem to be even stronger than creature grand souls. That's where the black soul gems come in. Thankfully, Falion just HAPPENS to have a black soul gem that you can buy off of him (mine cost. The problem is, normal soul gems cannot hold black souls. the quest is called ' The Black Star' the corrupted form of Azuras Star, travel to the Shrine of Azura to activate the quest. To even get this quest you have to first be a VAMPIRE. its called the black star and is one of the many daedric artifacts that can be obtained in skyrim. There is a very powerful Black soul gem that can have an unlimited amount of black souls pass through it (only one at a time) without the gem disappearing. I do not recommend selling them unless you need gold or don't use the enchantment skill.

There are two Dark Brotherhood Skyrim companions available to you once you. the souls level are much like the white souls level range(though I have yet to find a petty soul for a black soul gem) each black soul gem has a weight of 1 and a base value of 300 gold when empty and 750 gold when filled. Skyrim GEMS is a 1-page, quick-reference catalog of lore-friendly G ameplay E. Though Usually Grand the souls that can be trapped depends on the level of the characters soul you are trying to capture, Higher levels like bandits or other warriors obviously means higher level souls where as lower level characters like beggars give lower level souls. The purpose of this soul gem is for the capturing of black souls(Human/Humanoid characters)for use at the arcane enchanter.

Skyrim where to buy black soul gems