So the context of the conversation is pretty interesting.
There are a few things going on.
1, the first Night Warrior was male. Pretty interesting stuff.
2, he regards the object of protection as ‘our world’ Azeroth isn’t mentioned. This could mean a few things. Like the guys could be Dark Trolls, or maybe even in the early stages of the Night Elf society.
This could also mean that there is another world that worshiped Elune. There are other creatures in Ardenweald that discuss their worlds so. Maybe this was an early iteration of Elune choosing her chosen people, but they failed to survive?
3, the guy confirms the Night Warrior as a curse that will eventually kill their host. He also confirmed that if you try to purify it, it could have deadly consequences.
4, the first Kaldorei Night Warrior in Bastion is not retconned. She still exists.
All around, good stuff. Very interesting stuff.
Here's the Conversation:
Thiernax : Then her fate is sealed. My condolences, but you must let her go.
Thiernax : For your sake, as well as ours.
Kadarin : Please forgive my husband, Thiernax became the night Warrior to save our world, but he paid a dear price in the end.
Kadarin : Thiernax knew the risks, but we had no choice.
Kadarin : He invoked the dark power of Elune and together, we repelled the Invaders.
Kadarin : Though we had saved our world, the power of the night Warrior began to destroy him.
Kadarin : Desperate to save him we attempted to lessen his burden by sharing Elune’s power between us.
Kadarin : But our Gambit failed we both lost our lives and he has blamed himself ever since.
Kadarin : Let us head for the inner garden.
Thiernax : My apologies Shandris it is not… easy for me to speak of the Night Warrior.
Thiernax : More Spriggins. We’re being ambushed.
Thiernax : Never have I seen them Gather in these numbers.
Thiernax : Kadarin no, what have you done to him?
Thiernax : Kadarin… I cannot lose him again.
Thiernax : Nothing happened.
Thiernax : These Spriggins will pay for what they have done.
Thiernax : For now assisting you is all I can do for Kadarin.
Thiernax : If I had only fought harder… Kadarin forgive me?
Thiernax : That should be enough anima. Let us return with all haste.
Kadarin : What happened?
Thiernax : Kadarin, thank Elune It worked.
Thiernax : I know not if the Night Warrior’s fate can be averted, but I will do all that I can to aid you.
Thiernax : Yes, we are.
Thiernax : As Elune’s dark power raged within me, Kadarin and I were able to siphon some of it out of my body and into his
Thiernax : Perhaps but the ritual cost us our lives if we attempted again, we must disperse the power among several vessels.
Thiernax : The Night Warriors of Elune, all who bear the mantle are destined for these groves. We are in need of the aid.