Welcome To The Rabbit Hole

First of all, Astarion was going through an intense PTSD. The game gave him a debuff to show how badly going back to the place of his torment was affecting him. Larian couldn't make it more obvious that he wasn't thinking clearly.

Second, there is one thing all abusers have in common: they destroy their victim's feelings of self-worth to the point, the victim no longer wants or knows how to ask for help or have relationships outside their abusive circle.

Who would want you like this? Look at yourself, you think you're better than me? You're nothing. Who would want to waste their time on you? You think somebody else would treat you better?

Since entering the Cazador's palace, Astarion is reliving his worst moments. Initially, he takes it in stride, hiding his discomfort underneath performative and emotional expressiveness. He talks about how he spent time in the bedrooms where he never did any sleeping, about the kennels where he was tortured, about the barracks where he was sent to when he "deserved neither carrot nor stick". Bad memories, but he shares them with Tav because he trusts them with his scars already. They might as well know the rest.

But after descending into the dungeon, Astarion starts spiraling into self-loathing at a break-neck speed. He used to think that all Cazador victims he ever brought to him were long gone, drained, and discarded. A horrible, undeserved death, yet the thought of them not having to suffer for too long was a small consolation, one of the threads holding his sanity together.

But then it turns out that they weren't dead. They were turned. Locked away deep underground, alone with their new selves, with the hunger and isolation. They did suffer. All these years, they suffered, buried in this tomb - because of him. Cazador may have turned them, but it was Astarion who brought them to him. And they remembered it. They recognized him. The monster who stole them from their home. The monster who ruined their life. Monster. Just like Cazador.

So, as if his PTSD wasn't enough, this revelation was another blow to his grip on himself, his perception of himself. His confident facade was shattering - and in his head, he was starting to think that Tav's idea of him, of who he is, was shattering as well. He tried to warn them before. He said he couldn't be what they saw in him. Whatever person they believed him to be had never existed - and Tav was finally coming to realize that as they walked through the gallery of his sins, looking his victims in the eyes and hearing out what they had to say. Of course, Tav hated him now. They had to. How could they not?

So, at the end, he is scared. Terrified. He bit off more than he could chew by walking into the manor and thinking he had only six fellow spawns to deal with. He saw their lives as a small price to pay because Cazador made sure to erase any solidarity between them. He made them torture each other and compete with each other. He twisted the very meaning of family bonds to his perverted liking, and he knew that by doing so, he would make sure every single one of them would get a whiplash from anyone trying to mention family in a positive connotation. Astarion takes no issue with getting rid of his "brothers" and "sisters" because he is fully aware that had the roles been reversed, they would have sacrificed him without a second thought. And he was certain that Tav would change their mind once they learned more about his brethren.

But the spawns in the dungeon...All the faces he remembered. All the lovers he lured. They did nothing wrong. They never hurt him. They never tortured him. Their only mistake was to trust him.

The revelation horrifies him. His first response is to be shocked, overwhelmed with emotion - and then he has to remind himself that sacrifices must be made. He feigns indifference. He tries to cover his internal conflict with gallows humor. But his flippant mask keeps slipping as he lapses from indifference to anger, to guilt, to begging Tav not to hate him as his greatest crimes glare back at him and claw at him, shouting out threats and seething with hatred.

He can't bear the thought of dealing with all the people whose lives he helped to destroy. He can't do anything for them. Just killing Cazador won't undo what he did to them. He will never be anything but a monster in their eyes. And this is what he deserves to be. He will always be reminded of what he is.

He has no choice but to do the Ritual.

He has no idea what will happen to him after he is done - he isn't a planner. He has never been. But at this point, he doesn't see his soul as something worthy of preserving - and by association, he extends that to other spawns. He knows it all too well because he remembers how it felt. He dissociates, projecting everything he hated about himself onto Cazador's victims, trying to rationalize why he should live and why they must die while he actively avoids the truth.

Completing the ritual is no longer about being free. Or protecting himself and his lover. It's about running away. Even when Astarion has Cazador at his mercy, he still thinks of running away. Getting lost forever. So nobody could ever hurt him.

A part of him even realizes that it means running away from Tav too. But Tav can leave, he naively thinks, not knowing the full consequences of the ritual. Tav will leave to find someone else, someone better, and he will start everything anew, a king of his castle.

So, of course, Tav has to reach out to him through that thick haze of fear, anger, and self-hatred. Persuasion isn't about strongarming someone into doing what you want. It's not subjugation or emotional blackmail. It's reasoning with someone. And that is exactly what Tav does - reasons with Astarion after watching him mentally struggle, after seeing his genuine shock and fear, after understanding that he isn't fully on board with the idea.

It's true, vampire spawns tend to gravitate toward power, especially if nothing is pulling them back. A vampire spawn is a feared and scorned creature - it no longer matters whether they were an unwilling victim, forcefully taken and turned. They are seen not as an individual but as the extension of their master - and the only natural transition for them is to get on the top of the food chain. The only way to make a name and become treated as something more.

Astarion saw power as the mean to safety and freedom, first and foremost. Ironically, he never planned beyond securing these two priorities. He never saw himself after accomplishing his goals, and it's kinda amazing how people can make conclusions about his hedonism because he misses petty vanities, wants to drink blood from a goblet, and sleep on silken sheets. The man who was held and tortured in the kennels, fed rats, and had to stitch and fix his only set of clothes over and over to keep it presentable, the man who has never felt happy for most of his conscious non-life is called hedonistic for wanting nice things. For still wanting to take care of himself for once.

He wasn't harboring any grand plans, conquests, or schemes. Even his idea of taking control of the Absolute was abstract and shapeless because he didn't care about getting control over the most influential people as much as he was afraid of breaking whatever protected him from Cazador's domination. He never really knew what to do with power aside from keeping Cazador and the likes of him at bay.

The way Astarion behaves in a relationship also speaks tons of how controlling he really is...or how he isn't controlling at all. When his romance with Tav transforms into something real, and he enters a new territory, Astarion is empowered to make decisions and think about what he wants instead of pleasuring others. It's clear that he and Tav don't have sex after they come clear about their feelings. Tav respects his comfort and boundaries, gives him all the time he needs, and lets him take the lead. Whether they will have sex again or not is entirely up to Astarion. Whatever he decides, it won't change Tav's feelings for him. He doesn't have to do anything he doesn't want to do.

Astarion enjoys this new autonomy. He is playful, affectionate, outspoken...and afraid of messing everything up. If Tav mentions breaking up, Astarion thinks he is the problem. If there is another potential love interest showing they have eyes for Tav, Astarion encourages Tav to be with them because he believes they can give Tav everything he can't. When Tav says "I choose you," Astarion is taken aback, needing a moment to hide his genuine confusion at Tav actually wanting to be with him rather than Gale, Karlach, or Halsin.

For all his talks of control and dominating others, once Astarion finds himself with a lover who values his autonomy more than getting power at the cost of his dignity, who makes it safe for him to be honest, and who listens to him, he almost stops mentioning control. He merely lives in the moment, happy not to know, not to pretend, not to manipulate. Just to be.

What Astarion truly craves - not wants on a superficial level, not conditioned to want - is not to be a vampire lord. He wants the freedom to be anything. Anything he wants. Little does he know that true vampires rarely get to be anything they want, even if they gain the ability to walk in the sun -- we see it in his Ascended path as, instead of acting up on his supposed freedom to be anything, Astarion repeats Cazador's rules step by step. Just like Cazador did. Just like Verlioth did. He isn't anything he wants. He is the replica of his former master.

Astarion never had the luxury to explore who he wanted to be outside what Cazador made him. He only makes his first steps once he is free. We see glimpses of that deep-seated aspiration to be seen as a person. Treated like a person. Loved like a person. To be reflected in someone's eyes. He wants to know if there is someone beneath his usual mask, something his, not tainted by Cazador. Someone real. And at the same time, he dreads to know the answer. Because that part of him knows regret. Knows shame. Knows guilt. Confronting it posed the risk of realizing he didn't deserve love, kindness, or a future. What if real him truly doesn't amount to anything? What else for him to do?

So, he tells himself that he has no choice, and he expects Tav to affirm it -- not because he wants them to, but because he believes that Tav has seen enough to make the same conclusion. However, Tav objects, trying to be louder than all the inner demons hissing into his ears. Tav speaks to the Astarion, who asked them what they saw when they looked at him. The Astarion, who thanked them for standing by his side when he said "No" to Araj. The Astarion one who stood frozen in their hug before returning it tentatively. The Astarion who diligently, dedicatedly, caringly kept pulling himself together instead of letting himself unravel completely.

Tav reminds him that this Astarion, right here, right now, is worth fighting for. That he didn't survive all these years of torture, pain, humiliation, and dehumanization to give himself up now. He already has the power to avenge himself, avenge all Cazador's victims. He can end everything right here, right now - and this is the only power to free him. He has the power (and responsibility) of having a choice.

Tav empathizes with other spawns as victims not because they're more "innocent" than Astarion, but because associating with them doesn't brand Astarion as weak or broken. These spawns aren't horrible wretches, and neither is he. They don't deserve this, and neither did he.

The only one who deserves to die today is Cazador - the vampire, the monster, the pathetic piece of shit.