So a friend was asking me about Odyn and Helya, and I was a little fuzzy on the details myself, so I decided to go back and read the relevant segments of the Chronicle. Afterward, I was only more confused, so I want to know if I'm missing something.
Here's a quick summary of the story of Odyn and Helya from the Chronicle:
Odyn didn't trust the Dragon Aspects to defend Azeroth, so he wanted his own army to do the same thing. His idea was to grab the souls of epic warriors from the Shadowlands when they died, and bring them to the Halls of Valor. The problem was, someone needed to be undead to do said ferrying. No one wanted to do it, and Helya tried to talk him out of the whole thing. In response, Odyn turned her undead against her will, to be the first val'kyr. Others were also turned undead against their will to be her val'kyr servants. Helya and the other val'kyr were sworn to follow Odyn's orders, despite not wanting to, so Odyn got his army.
Meanwhile, Loken was being corrupted by Yogg-Saron. He needed Odyn out of the way, but knew he could not win a war against him. Instead, he decided to go to Helya, who hated Odyn. They freed Helya from her obligation to follow Odyn's orders, and she removed Odyn from the picture by sealing the Halls of Valor away in a pocket dimension. Now Helya and the rest of her val'kyr were free, and the ones with any nobility left broke away to become the Spirit Healers.
Why this confused me:
In the Chronicle, the val'kyr are undead. In Legion, they appear to be creatures of the Light.
In the Chronicle, no one wanted to be a val'kyr, and they all had to be forced. In Legion, becoming a val'kyr seems to be a great honor that people must earn.
In the Chronicle, the val'kyr were on Helya's side and with her when the Halls of Valor were sealed. In Legion, Odyn has val'kyr, but it doesn't look like Helya does.
In the Chronicle, Helya was the leader of the val'kyr, even after breaking from Odyn. In Legion, it appears as if Eyir (who wasn't in the Chronicle) is.
This bugs me because Legion doesn't really go into detail about the relationship between these powers. I thought that was because we already had the lore in the Chronicle, but it looks like an almost completely different story to me. Am I missing something?