The Dread Doctors are believed to be Outsiders.

Also known as Abominations, the Outsiders are creatures that exist beyond the limits of known reality, beyond even the Otherworld, coming from a place known only as Outside. Their exact nature is not known, save that they are often very powerful and dangerous, and they seem to be such anathema to the life of known reality as to be completely unable to coexist peacefully with native creatures.

They are heavily inspired by the Lovecraft Mythos Caution.

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