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 Hydro Garden anomaly has appeared in the recent awakening of worlds as observed by Polo. Despite being part of the true exotics, the landscape of a Hydro Garden world mostly resembles a bleak steppesland. This grassland is littered with mineral pseudo-mushrooms, which consist of iron and calcium, and serve as a nurturing ground for plantlife below their caps. These 'odd' stalagmites are completely unnatural and the glowing glyphs on their outer shell imply they are allegedly artificial. As the subbiome name implies, and the little greenery so unusual for true exotic worlds, this was an attempt to terraform the biosphere, which had a minor degree of success. It is unclear which entity attempted to renew these worlds, as their first appearance during the dimensional collapse is too recent. Smaller versions of these Calcishroom terminals can be acquired and brought back for study or for showcase. Perhaps the future will shed light on this mystery.

The weirdest presence on these bio-engineered worlds are the Wisps, some of which can be quite noisy. They appear on several of these worlds and seem to 'greet' travellers. Either that, or their active movement towards visitors with an agitated bloat is a gesture of threat. No reports of aggressive first contact has been documented yet, however.