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So according to the lore, Malekith was prophesied to be killed by a sorcerer. So because of that, he has forbidden male dark elves to become sorcerers in order to avert the prophecy under pain of death/forced to become Doomfire Warlocks.
Because the prophecy wasn't fulfilled after the End Times, is the prophecy fake, misinterpreted, forgotten or is it still likely to happen in Age of Sigmar, since Malek----I mean, Malerion is still alive and kicking.