Location from baldurs-gate-3 by Larian Studios
A vast subterranean realm of bioluminescent fungi, alien ecosystems, and civilizations that have never seen sunlight — beautiful, lethal, and indifferent to surface-world morality.
The Underdark doesn't care about you. Its bioluminescent mushroom forests glow in colors that surface eyes weren't meant to process. Sussur trees emit fields that devour magic. Bulettes tunnel through stone like water. Hook horrors click in the darkness just beyond your torchlight. But it's not just a dungeon — it's an ecosystem. The Myconid Colony operates on collective consciousness and radical hospitality. The Spectator guards treasure it was summoned to protect centuries ago and has gone slightly mad from loneliness. The duergar run slave operations with industrial efficiency. The Underdark teaches you that 'monster' is a surface-world concept. Down here, everything is just surviving.
Also known as: Underdark, The Deep, Below