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Ropers (ローパー) are a heteromorphic race of beings from YGGDRASIL.
There is very little information on Ropers, though what is known is that they exist in both YGGDRASIL and the New World. In addition there is a subspecies known as Herdropers that possess a hive mind.
According to the Narberal Activity Report, a Roper's fluid is some kind of powerful secret drug.
- Ropers are officially introduced in the Light Novels in the Overlord Bonus Volume.
- According to the author Maruyama, one of the Five Worst is a Roper-type monster.