The dates during the first three months of gameplay (all in year 3E433) are listed below Days Passed It happens every eight days, starting from the first day of the game (i.e., the day on which Uriel Septim enters your cell in the Tutorial). The Shade of the Revenant occurs on the same day at all four locations. The Shade of the Revenant being used to create Black Soul GemsД«lack Soul Gems can only be created during the 'Shade of the Revenant.' As part of this phenomenon, a purple light shines down from the sky on each of the four Necromancer Altars.Д®ach Shade of the Revenant starts at midnight and lasts for 24 hours, until the end of that day at midnight (although the Shade may not actually be visible during daylight hours). Only one will be transformed for each Soul Trap spell, but you can cast one spell after another. Repeat step #4 for as many spare grand soul gems as you have.When you open the altar again, one grand soul gem is now an empty black one. Once the light is shining on the altar, place one or more Grand Soul Gems in the altar (it's a container like a chest).The purple light is very soft by the time it gets to the altar, and if you are standing directly in front of it you may not realize it is shining and wait right past it.

When waiting for the purple light, do not stand directly in front of the altar back up so you can see the altar and a fair portion of sky.Or you can calculate when the next Shade of the Revenant will occur, go complete other quests, then return on the correct date. If there is no light there when you arrive, you can use the wait command to wait 24 hours at a time.Wait for the correct day, namely the Shade of the Revenant ( see below for details).Outside each of these locations, you will find a white altar draped in a red cloth. First, head to one of these locations: Dark Fissure (Northwest of Doomed Mine), Fort Istirus (east of Kvatch), Fort Linchal (northeast of Kvatch), or Wendelbek (at the headwaters of the Panther River).A method of casting the Soul Trap effect, which requires a minimum of level 25 Mysticism (enchanted weapons will not work).One or more Grand Soul Gems (empty soul gems are best, but gems you have filled yourself can be used, see notes).Creating Black Soul Gems Items and Capabilities Required

How to get black soul gems in oblivion