well, first you need to find one of those alters (if you'be done the mage's guild quests, you know what i'm talking about, they have the death look to them, they're outside certain caves and forts, one of them is i think south of kvatch)
then, on a day where a purple-pink light is shining down on the alter, put however many gems you want into it, i.e. you wnat 5 black soul gems=you puting in 5 grand soul gems
then, cast a soul trap spell on the alter for how many gems are in it, then attack it with your weapon (it might be cast the spell once and attack it for how many gems are in it, try both ways)
then open the alter and there are your new hand-made black soul gems, you can capture people's souls in them
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