The Far Realms
An anomalous plane, the Far Realm is a bizarre, maddening plane said to be composed of thin layers filled with strange liquids. Visitors to the Far Realm can only exist in one layer at a time, but large Far Realm natives can exist in multiple layers at once. Creatures native to or connected with the Far Realm generally have the aberrant origin. A crystalline structure connected to the Far Realm, known as the Living Gate, stands in the Astral Sea. Creatures such as the Beholder or the Gibbering beast are very corrupted by these realms.