Okay, what you have to do next is go to the level with the Eye of Set thing. It repels your party and no one can pass it. After you've experienced that, find Nheero again and ask for some of that mod potion. You'll have to wait until his transformation wears off to get it.
Unfortunately, I don't know where you'll find him; someone else here may be able to tell you. All that studying up on monsters is pretty bogus; you don't need the info that much and it just stretches out this part of the game.
Nightowl2
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