Unfinished quest, or at least very buggy: according to UESP, if you enter Lost Boy Cavern while under level 23, the final boss Erandur-Varangil will be... like this. Ghost-mode turned on, nothing affects it. But the patch supposedly makes it so that if you come back later at level 23 or higher, he's hostile and you can fight him.
I don't think I'm gonna bother lol. I don't like what happens to the game world when we hit lvl 20 or so. Bandits with Glass and Daedric. Ridonkulous. Skyrim does it a lot better.
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