Apostles of Chaos (混沌の使徒, Konton no Shito) are a group of familiar looking beings found near the end of the Collaboration Scenario and in some of the games included in it. Not much is known about their origin or purpose.
Apiro Lagos is one of them. According to them, the Apostles of Chaos are waiting in the gaps between history for the coming of someone or something, whose identity or nature isn’t revealed. In 2.40, Idea Lukas states the ambition of the group as they will return everything to chaos in the Labyrinth of Chaos