What is The Eye doing?

[RobinMalvin]

Is this the case? Seemed more like he was just using it... If you have to be chosen in order to use it then I'm even more confused by it, given how Estinien effectively crippled Nidhogg with it... Why give your enemy that much power over you? Heck, the Eye wasn't even meant to be carried around, it was kept in the Vault until Estinien stole it, indicating that the Azure Dragoons never really directly used the Eye...

Haldrath had the Eye until his death, hadn't he? And with the fact Azure Dragoons need the Eye's power to fight Nidghogg on equal footing, and Estinien brought the Eye with him during our journey together, I'd assume that Azure Dragoon would keep it in person when fighting Nidhogg. It was because Nidhogg was thought asleep and thus not an immediate threat that the Eye was kept, until Nidhogg awakens.

I never said the Eye reacted to Thordan. I said that the Eye answered to him, when he reached for it, allowing Thordan to access its power with no apparent difficulty despite Nidhogg's presence in it. Unless you count the Eye's glow as a sign it reacting to someone, then yes, Thordan also qualifies.

But I honestly don't think you need to have the Eye reacts to you in any way to use its power, but you have to beat Nidhogg's will in a mind battle first, which is said to be extremely hard it took Estinien crippled to cripple Nidhogg. With Thordan could access its power seemingly without effort can be adressed to the fact that he was primal when we saw him used it, or that he made Nidhogg's will inside the Eye to submit, making him somewhat one of the chosen and allowed to use it, just like how Azure Dragoons do.

Then, we toss both of Nidhogg's eyes into a chasm... so what happens to the power of the Azure Dragoon? Do the eyes still give someone their power? Shouldn't the WoL be a DRG no longer...? Gaaahh!

Eyes of a dragon can store the surrounding aether inside, so yes, they can still give power to anyone wielding it.

Dragoon's abilities and skills come from training, not the Eyes. It's Azure Dragoons who can tap into the Eyes power, giving them extra power to be able to face stronger dragons i.e Nidhogg. As Alberic has confirmed, an Azure Dragoon can give up their link to the Eyes' power. With Estinien being the last Dragoon to ever bond with the Eyes, I believe his link has been severed when he's freed from the Eyes' grasp, or he simply gave it up when he put down his spear.