Chaos Entity

"The thing about Undefinables is that they are pure, unpredictable chaos. Those things could obey the laws of the reality they're in during one instant and the next they start breaking every one. One could start swallowing souls for an aeon, and then suddenly it can't interact with them at all. You can't ascribe to them a set of operating rules when they can break and change them at random."
Chaos entities, otherwise known as Undefinables, are beings and phenomena that operate on incoherent principles and with little to no internal consistency. 
== Description ==
Undefinables usually appear as masses of random phenomena.
"There is a popular joke about Undefinables. A squad is sent to exterminate a million chaos entities. They manage to kill almost every one without trivial ease. Then the last one trounces the squad in a single strike. When the squad returns for a rematch, it curls up and shrivels out of existence. Whatever you do against an Undefinable will work until the cosmic dice rules that it doesn't. Or it doesn't work and suddenly it does. There is no such thing as consistency about chaos entities, only randomness."