The Atoll of Madness is a biome and world that is accessed during the Portal to Darkness event using a Mysterious Portal. It consists of an island made up of several Atoll of Madness biomes, surrounded by the Stygian Sea. It is used for most Portal to Darkness quests. The Mysterious Portal can still be used to access the Atoll, despite the quest line / event being over.

It is very similar to the Forbidden Shadows and Shores of the Everdark, but the Atoll lacks Shadow Colosseums and instead has native enemy spawns everywhere.

It is inhabited by many different shadow enemies.

Atoll of Madness icon

The Atoll of Madness is displayed on the map as a pale orange biome, with a watermark pattern of a Tentacle, much like that used for Lairs in Geode Topside. The biome yields only Primal Grey blocks from dirt or stone, with Primal Purple blocks from stone pillars and arches. There are occasional blue orb-like plants, as well as "rivers" of damaging bones or spikes.


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Biome Colors

The biome is entirely dark purple with occasional streaks of glowing bright blue or purple, as well as rock pillars to give it a dark, shadowy theme.

Atoll of Madness


The flora of the Atoll of Madness consists purely of glowing blue orb-like objects, which function as proximity mines; when a player approaches, they will open and begin smoking, then shortly detonate, stripping the surrounding area of blocks and inflicting damage to the player.


The Atoll of Madness lacks any lairs or dungeons.

The inner and outer Atoll have different enemies, despite the biomes having the same name.


Enemy Inner Spawn Outer Spawn Invasion Spawn
Enemy Shadow Serf Shadow Serf Yes
Enemy Phosphage Shadow Phosphage Shadow Yes
Enemy Darknik Warbot Darknik Warbot Yes Yes
Enemy Machinegun Machinegun Yes
Enemy Shadow Stiltstitcher Shadow Stiltstitcher Yes
Enemy Shadow Nautilus Shadow Nautilus Yes Yes
Enemy Shadow Boot Shadow Boot Yes
Enemy Shadow Observer Shadow Observer Yes
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