It appears that Lisara has won!
Alrighty, then let us begin.
Before her banishment, Lisara was a high-ranking leader of the Blooddrinker Legion, the most brutish of the Demon Legions. Being physically weaker than most other succubi and other Demons, Lisara had to trick and outsmart her enemies within her legion to make a name for herself.
Already noticing some differences between her and Ornassion...
So she was only weaker than the other succubi in physical terms? What about in terms of magic? Because if she was weaker also regarding this, and yet her fused with Aedale managed to overpower both Redifst and his bodyguards, then I can only imagine if Aedale had instead fused with Ebira.
One of these enemies was the brutish dreadlord Ornasion the Destroyer, also called "Pit Dreadlord" by others of his kind due to his apparent simple-minded behaviour. However, Lisara learned first-hand that he wasn't as foolish as he made others think. Lisara, who had tried to trick him into fighting against her enemies to weaken him and to strengthen her, was fooled by him. He made her believe that he'd do as she said but instead let her enemies kill several of her most competent underlings, severely weakening her.
Then does that make Ornassion smarter than Lisara or did he outsmarted her simply because she underestimated him?
Lisara managed to manipulate Aedale but this is not that much of an achievement since: a) Aedale already had quite an inferiority complex and a nasty backstory that made her easy to be used and b) Aedale had already absorbed two demonic artifacts. If Lisara is a cunning manipulator, that is not shown in the campaigns.
Instead of killing her for her attempt to trick him, Ornasion offered Lisara a chance to work for him instead. Being impressed by the dreadlord whom she had considered nothing but a brute in the past, she accepted. Even before Ornasion became the leader of the Blooddrinker Legion, the two got closer and had feelings for each other that were... unusual for Demons.
And both ended up being betrayed.
However, when Lisara opposed the demoness Ebira of the Souleater Legion, Ebira's machinations managed to turn her into a traitor in the eyes of many. It took a long time, but finally even Ornasion began to doubt her loyalty and allowed Ebira to imprison Lisara - under the condition that she would be left alive and otherwise unharmed.
I wonder if Lisara's resentment towards Ornassion was lessened due to this. He did his best in ensuring that she was left in the best condition avaiable.
This is even more tragic in hindsight. Ornassion ended up being betrayed by the Souleater Legion as well. He perhaps, either in his final moments as a demon or in his first moments as an undead, realized that Lisara was also a victim of their manipulation as well. That could add yet another reason for him to despise his former race, since they made him mistrust, betray and imprison his lover.
I wonder what Lisara would feel if she was to know Ornassion's death. Would she feel satisfied that karma got Ornassion or pity that her former love was once again a victim of the Souleaters' manipulations?
I now want to see in the SUB he having the chance to shred Ebira into pieces for using him to get rid of Lisara.
Regardless, Lisara felt betrayed and alone, as she was imprisoned for centuries. Hatred filled her and she only longed for one thing: Revenge.
And yet, her actions throughout the books are not guided by this. Her manipulating Aedale and eventually consuming her, killing the Golden Guard (in the Golden Guard storyline) didn't affect in any way the demons that she despised.
I know that she joined the Dark One in return of getting her revenge, but she is either very patient, the Dark One is holding a very tight leash or she has become truly devoted to her new master. The demons invaded Arkain, got defeated and pretty much sealed in the Void and the Dark One played little role in this. In fact he must have delayed the demons' defeat even more.