You don't fight Odyn for his evilness though
I'm pretty sure your character didn't read Chronicles, he also is actively helping against the Legion, but thats ok I guess lol.
Eh? All I've seen from her in the Beta is that she wants to screw over Odyn, and that ''deal'' with Sylvanas which we don't even know what it is yet. But people are amusing its to get Eyir because Helya told her to. But we don't know. As far as her actively throwing her lot to fight the Legion, that isn't happening in the Beta at all.
We will kill Helya because she is too ugly to be left alive.
Helya is influenced by N'Zoth.
When she's been freed by Loken from Odyn's will, she created Helheim and bound it to the Great Seas, hidding her realm in the oceans' mists.
And who else is living in the oceans working with N'Zoth? Azshara.
The Kvaldir are Helya's minions, vrykuls brought back from the Shadowlands by Val'Kyrs that obey Helya.
Where did you first encounter Kvaldir? Northrend, south of Borean Tundra.
Who could you find there? A Naga emissary, imprisonned by Kvaldir. The Naga was pissed off by their attitude and asked you some help.
Why a Naga emissary is with Kvaldir? Because you know, Azshara/N'Zoth/Helya. Why is the emissary imprisoned? Because you know, Lich King took control over Northrend's Kvaldir.