Well if given a choice between Nidhogg and Lahabrea I would bring back Lahabrea.

Again an MMO problem: If we don't have recurring villains we will just kill them all. And as we go stronger, so do the villains we kill. MMOs need to go on for years. You can't go on for over a decade if you can kill Ascian overlods left and right. Soon there won't be another credible threat left.

A bonus question to debate: After being missing since 3.0 Yugiri is back. What do you think? How much of her absence was planned and how much of it was due to what happened to her voice actress? It's not really a lore question but it technically IS about how the story could have gone.