Abominations
Abominations are creatures that exist beyond the limits of known reality, beyond even the Otherworld, coming from a place known only as Outside. For this reason, they are also often known as "Outsiders." 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.
Abominations are especially known to operate at odds with demonic power, and most demons who are aware of abominations will do anything in their power to oppose them.
They are in some ways inspired by the Lovecraft Mythos
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In other contexts, they may be known as Outsiders.