Since the moment he resided in this land, Kairen got to know many things. He experienced a lot of odd incidents and was put in a lot of strange situations. As a result of all of these, he got to find answers to a lot of his questions and finally manage to combine his small piece of knowledge to gain a proper view of the world.
He still didn't know about the details of the things that happened in Reynold's world as the ketchup bastard wasn't back yet, but he didn't really need him and his dramatic flashbacks to create his proper view and organize his knowledge.
'First of all, the chain. The chain is still functioning and holding the world, but at the same time, it is being destroyed by a power named Irregularity. Irregularity is a power created due to Chaos and Abnormality clashing with each other and destroying the chain.