Lahabrea & Nidhogg **Spoilers**
This has been something I have been considering the last couple days. When Lahabrea was 'killed' by King Thordan he was absorbed the eye of Nidhogg that was in the Thordan's sword.
Lahabrea was significantly weakened after his battle with the WoL, which may have made the capture of his essence much easier. I believe consensus on this forum is that this didn't fully destroy the Ascian soul, rather Lahabrea has become trapped in Ninhogg's eye (which is a massive aether battery).
Following Thordan's defeat this eye along with the other long held by the Azure Dragoon, use Estinein as a host in the recreation of Nidhogg's form. Whether or not this form is the true Nidhogg is up for debate (until future patches), but what I believe is significant is that Nidhogg now retains inside himself an Ascian soul. Could it be possible that Lahabrea, though weakened, may reassert himself in the future and manipulate this vengence fueled recreation of Nidhogg?
I believe it offers up significant possibilities with regards to the threat Ascians pose, as they have become something of a paper tiger of late compared to the power possessed by the WoL. I am interested to see how this and the Warrior of Darkness develop the power of the Ascians