Exotic worlds are characterized by having various mysterious objects not found in any other biomes. When viewed from space, most of them look rocky and pockmarked by holes. However, there are some that look like giant, artificial Hex worlds. The games' code for these worlds is "Weird".

Unlike dead worlds, there is no elevated strain on life support. Unique structures and, very rarely, vacant bases can be found here as well. Gold deposits can sometimes be found on these planets. Exotic worlds will never have water.

More uniquely than other biomes, flora and minerals are wholly determined by the specific sub type of exotic biome; Exotic biomes will only have a handful of unique flora and mineral types exclusive to this biome. An exotic biome will almost always have only one type of fauna, although rare cases of exotic worlds with two species of fauna have been found.

A single unique Stabilised Reality Glitch will be found in each exotic biome.

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As one of the new exotic subbiomes, the Bone Spire anomaly has appeared in the recent awakening of worlds as observed by Polo. It is characterized by floating cross-shaped rattles and tentacle plants. These plants emit a faint red-orange hue at night, while the rattles glow yellow through ring-shaped crevices. Smaller variants of the Rattle Spine can be collected and showcased as an exotic trophy in bases and labs. While harmless, the sudden appearance of a Bone Crawler can surprise local explorers as it digs through the ground nearby with only its spikes breaking through the surface.