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Unknowns are mobs that don't quite fit into any tier. They're easily the most diverse tier, as the mobs in it have almost nothing in common. They all spawn in different ways and share nearly nothing in common. They range a lot in power and unique abilities. There are a total of twelve mobs in this tier.
Unknown Mobs
Combat Unknown Mobs
Utility Unknown Mobs
Trivia
Unknown mobs are also called anomalies, due to their spawning nature.
Calamity limbs are referred to as 'FallenMultipartEntities' in the code.
Gallery
A group of Hallucinations spawned by a Delusioner.