I had to Google what "reigns of chaos" was. It looks like yes, Blizzard was using the term correctly. We have three words here:
Reign: a verb meaning rule.
Rein: a noun meaning the strap or rope held in the hands to control a horse, and a verb derived from that by analogy, meaning "to keep or bring under control".
I distinctly remember the first time I looted the reigns of chaos after farming it for months on like 5 different alts, it was reign, not rain
I had to Google what "reigns of chaos" was. It looks like yes, Blizzard was using the term correctly. We have three words here:
Reign: a verb meaning rule.
Rein: a noun meaning the strap or rope held in the hands to control a horse, and a verb derived from that by analogy, meaning "to keep or bring under control".
Rain: drops of liquid water coming from the sky.
You didn't have to Google anything, you could've just taken my word for it.