Yep it's in kua toa dungeon. My suggestion is to wipe all the three dungeons.
And EYE OF THE BEHOLDER was a GREAT game (specialy EOB2, Eob1 was fine, eob3 was disapointing)
also a great song
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"Not for your eyes only, also for your beautiful ears.."
Yngwie J. Amadeus Zoltan "Diamond Fighter of Aerie Lovers Sacred Band"