I think the only way to open that door is to -
SPOILER
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Turn into the Slayer. I've played 4 single games and 2 multi games and have never yet got that door open with a Mind Flayer. I could be wrong but the Slayer will definitely get it open for you. Change back quickly though or the Slayer change will begin to damage your character.
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It's bleedin dark down here, slippery too.
Man, that's a pisser.
