With Nael reviving I meant Eula's "Nael". I think the real Nael's death is ok because that was necessary for Eula's "death" and the "birth" of Nael van Darnus. I truly love him even more than Zenos (whom I love too), and it's a shame how the villain who destroyed the world to save the game is falling into oblivion. I don't think Nael should stay dead, his goal to clean the existence with crimson light is unfinished. xD May his damaged mind found a safe place.
And yup, I say "him" just like the game. I see Eula as a woman who became a man as Nael.
The thing is... Does not hurt you when your favourite characters are 100% dead while others that are supposed to be dead too are found alive? Now wait not for Nidhogg, but for his Voidsent version (I think I read in Anemos that when a wyrm dies, a Voidsent is born).