The Ironsong Tribe

Ny'alotha is a non-linear raid:  at several points we can choose between multiple bosses.

Here's how the order works:

I've done some reading, and the suggested order for the bosses is:

Wrathion --> Maut --> Prophet Skitra --> Dark Inquisitor Xanesh --> The Hivemind --> Drest'agath --> Shad'har --> Vexonia --> Il'gynoth --> Ra-den