Necromancer Altar

A Necromancer Altar is required to convert a Grand Soul Gem into a Black Soul Gem. They can only be used once a week on a certain night of the week. On the night one can be used, it will have a purple beam of light shooting upward into the sky (see screenshot). This beam of light is more noticible further away from the altar; if you are standing directly in front of the altar, it is easy to miss.

Using a Necromancer Altar

To use a Necromancer Altar, put the empty Grand Soul Gems you want to convert into the altar on a night when the altar is active. Close the altar and cast a Soul Trap spell on the altar to convert one of the Grand Soul Gems into a Black Soul Gem. This process is repeatable - cast Soul Trap as many times as you have Grand Soul Gems to convert. (See screenshots for the before and after),Realy it's geater Soul Trap.

Necromancer Altar outside Dark Fissure

Active altar with the purple beam of light on it

Place an empty Grand Soul Gem into the altar

After casting Soul Trap on the altar you will find a Black Soul Gem inside

Necromancer Altar Locations

• Fort Istirius - active on Morndas
• Fort Linchal - active on Sundas
• Dark Fissure - active on Fredas
• Wendelbek - active on Turdas

Azura's Star does not succesfully turn into a black soul gem.