Discord was free once more, but he knew that there might some way his plans could go south.

So he gathered some of the most chaotic beings that he knew existed.

Humans.

So went to six other worlds to capture and convince six humans to do his bidding, and rule Equestria into a world of chaos.

This is only the beginning.

One of two spin offs to two stories, Six and From Wires to Wonders.
Here is the other half, The Codex of Chaotic Heroes

Officially starts during the start of S2 opener, unofficially, before.