In the whole lolore so Kil'Jaeden crafted the Lich King armor personally and forcibly bound Ner'Zhul to it. According to Shadowlands Kil'Jaeden harnessed the Shadowlands magic to power it and was aware of this place the entire time.
But either forgot about it or didn't need that pussy shit for the rest of his career.
But either forgot about it or didn't need that pussy shit for the rest of his career.
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