Ruoom's Hive
In the lair of a mind flayer colony, the safety and security of its residents is all-important. As a result, illithid lairs are always well hidden and well defended, almost always underground, and within easy reach of humanoids and their succulent brains.
The illithids, with their ability to levitate, design major portions of their lairs so as to make movement as difficult as possible for ordinary two-legged creatures. In such locations, thralls must climb or use ropes to move from place to place.
Source: VGM, page 77.
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