Aberration

An aberration is a thing that is "other."

Aberrations are foreign. Alien. It is a category of the uncategorizable. They don't seem to make sense. We don't know what they're about, so we toss them all in to this category.

Most of them are extremely dangerous. It's not necessarily because they're malevolent, but rather because their morality is so utterly alien to us that they often come across as capricious and malignant. They do horrible things in such a nonchalant manner that we cannot help but interpret them as evil.

Know types

• Aboleths.
• Anathemas.
• Beholders. Giant floating eyeballs with tentacles who think they're the coolest thing since sliced bread.
• Coleopterans. Beetle people who don't exist yet.
• Daelkyr. A group of interdimensional horrors who manifest in material reality as highly psychic humanoids. In Eberron, the daelkyr are the big enchilada aberrations, not the aboleths: the daelkyr created many of the other aberrations as living weapons.
• Driders. These are drow transformed into half-spider half-elf monsters.
• Elder Things. Big flying starfish.
• Neogi. Neogi are a race of space-faring eel-spiders. They are highly psychic and are notorious slavers.
• Nilshai.
• Proteans. Flying crocodiles who don't really want to eat you so much as they want to eat reality.
• Psurlons.
• Quori. The quori are a group of entities from the world of dreams.
• Seugathi.
• Slaad. Nasty frog boys who are not friendly.
• Star-Spawn.
• Tsochari.
• Uvuudaums. The lords of the Far Realm. These are nightmares made real.