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When opened via the available lever, Na-Krul is only slightly weaker than Diablo, though he lacks Diablo's Apocalypse spell, or any sort of magical attack. (Admittedly, that's a big lack.) However, it's possible to nearly cut Na-Krul's hit points and AC in half by throwing reading the levers spell books in front of his room, in the correct sequence. The sequence is revealed by assembling the three pieces of the torn note, and explained by reading the various lore tombs tomes scattered throughout the Crypt.