Maybe Balthazar wasn’t evil like we thought because maybe he saw how bad it was to gift magic upon the races of planet Thyria, especially humans, like Abaddon did. Maybe He understood why Abaddon wanted to take this gift back.
I have this own headcanon that Abaddon knew of everything that will happen in the future but when he gifted the world magic he didn’t quite realize because his heart was too good and later when he saw what harm it caused he wanted to take it back. And because of this, because Abaddon was misunderstood, the other Gods cursed him and so he turned under painful circumstances into the very being we fought in Nightfall.
Later Balthazar realized this too and because he rebelled and thought that humanity is better off dead for what harm they’ve caused he was exiled too.
I also have this theory that the Elder Dragons were once created as guardians to Thyria and its magic but later they became corrupted by an unknown evil. The fact that Kralkatorrik said to Aurene that he never wishes for her to kill anyithing she loves shows that Elder Dragons are capable of emotions and the concept of love. Also in the end Kralk’s last words were “Mother...” which leads to a greater mystery and the fact that even Elder Dragons recognize their family.
Zhaitan became evil because he knew he was the weakest of his bretheren and he feared that. Zhaitan was relatively small compared to the others and he feared that. Zhaitan couldn’t even speak aside from his servants because he wasn’t strong enough. Zhaitans fear drove him mad and caused him to be evil.
Mordremoth slumbered but he was still stronger than Zhaitan because he was more gifted. He was originally the keeper of Life, Preservation and Mind. However everything changed because his pride and greediness corrupted the once Elder Keper of Life when he noticed that his brother Zhiatan, the Keeper of Death and Shadow was slain. At first the Jungle Dragon denied it but then he realized that even Elder Dragons are mortals. A bit of fear but mostly his pride and hunger for more power drove him more and more mad.
We know that Kralkatorrik was around for longer than them and he caused havoc far before these two. It’s simply because Elder Dragons are forces of nature and guardiand to the elements and magic flow of the planet. After all it is simply in their nature to dominate and to protect. However Kralkatorrik was gifted with seeing into the future and he was also the Keeper of Crystal/Beauty and Fury. However he knew that his own blood will be his weakness and he feared betrayal deeply. Once his visions had overcome him he became mad and it turned his keeper likeness into evil. But fear not, his gift as an augur sprung over to his child Glint and later to Aurene. In fact Kralkatorrik cared deeply for his offsprings and that’s why he passed his leftover sane wisdom on to Glint and Aurene. Later on Kralkatorrik’s agony after he consumed too much magic corrupted him even more and crazed him absolutely. However after the Commander and Aurene granted him salvation he passed on all of his wisdom to Aurene and the lesson that Aurene should “never kill what she loves” which means that Aurene should never succumb to corruption and never hurt what she has sworn to protect.
Anyways there’s also Primordus of which we don’t know much as of the other dragons but I guess that his gluttony and wrath have driven him mad.
Now there’s Jormag, the keeper of Illusion and Ice. Jormag also had the gift of visions but with the side effect of altering it. We still don’t know much about the real Jormag but I believe they are aware of their weaknesses and Thyria’s future and they really want to change something but there’s also that urge for manipulation and dominance.The keeper of Ice and Pursuation is also known for inheritenting Lust as they can seduce others easily. We still don’t know how much Jormag has been corrupted and if maybe Jormag has cured their corruption a bit already. The dragon seems too self aware but maybe this is all a trick. We’ll never know. However I think Jormag is the most conflicted Elder Dragon of them all.
Now on to the Ocean Elder Dragon... we truly don’t know anything about it but I believe it’s connected to Kuunuvang and that Kuunu is its champion but the ocean dragon has good intentions and actually wants to preserve and protect life on the planet. “Mortals are little flames. Brilliant hot, then gone...” either Kuun or the sea dragon said this but if the sea dragon said it it’s clear that the dragon knows that even the Elders are mortal and can go out like flames at any moment. But it could also refer to that the dragon realizes that anything on Thyria is mortal, fragile and deserves to be protected. Maybe the dragon observed the other actions of its relatives and wants to truly change something. Maybe it is the only dragon untouched from corruption.
However know let’s assume that Kunnuvang said this trying to convince the ocean dragon to be good and to cure the corruption among dragons. Anyways, I think it will still be the same. Only time will tell.