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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The irri shells anomaly has appeared in the recent awakening of worlds as observed by Polo. Its main feature is a surface littered in capilliary shells which can both be plant-like or animalic in function. They surround inside the sea of broken shells, what seems to be plant-like sprouts but also finned sickle-shaped protrusions from the ground. The general asthetic seems to imply what truly has happened to these worlds lingers deep below the surface and could range from a minor phenomenon of plants and seeds to a huge infestation of worlds akin to zergs from Starcraft.

For those that decide to stick to the safety of the surface, several larger Capilliary Shells can be found and secured for further study and showcase along the way. While the surface itself is mostly deserted and dead, some of the remnant shells form small clusters that seem to animate akin to dragonflies, yet no actual body is seen. The Animated Shells' eerie dance among the air and sky of the planet just adds another layer of mystery and threat, though they pose no actual danger.