Casca will kill Griffith, not Guts.
I left the Berserk fandom for good when I saw that people thought Griffith's death would be the result of Guts' revenge.
I'm going to be very blunt, but even though I deeply despise the depiction of her rape during the eclipse, one thing was well portrayed: Femto used her as a tool to hurt Guts. She was so dehumanized that Femto had only one obsession: torturing Guts' mind.
The last thing Casca says before losing her mind is to not look because she KNOWS that she is only a tool directed at Guts and that her own suffering is a weapon that is not intended for her.
That's why she becomes what she is, an empty doll.
Femto didn't even consider it a necessary sacrifice for his transformation; Guts’ suffering was, the deaths of Falcon's troop were.
So if anyone should behead Griffith to remind him that she is part of this confrontation, it is her.
Femto raised awareness of the existence of others, because that is where the whole notion of sacrifice lies.
Casca did not even grasp the concept of sacrifice.
Casca, who fought her whole life to be worthy of the Falcon troop, was not considered a full member; she was just a body. She was not sacrificed; her existence was DESTROYED.
So when the spirit fades away, only the body remains
This Casca is exactly how Griffith envisioned her while triggering the eclipse. A body without reason
So when Casca, that body without a soul, sees Griffith again, she is obviously moved, more sad than afraid, because only one question remains: Did Griffith ever see me even once ?
Griffith wounds Casca while paradoxically saving her, because in the graveyard created by Rickert, he once again denies her role as the sacrificed and dead member of the Falcon Troop: he doesn't have the nerve to save her, he has the nerve not to consider her part of this graveyard.
The complexity of Guts' reaction is that, on the one hand, he had this dark side, where when he attacks Casca, his obsession with Griffith takes over, denying her existence once again. That's why Guts does it unconsciously and literally doesn't see her: because Casca doesn't exist at that moment.
But the beauty in the care with which he treats Casca lies in the fact that Guts is constantly mourning her loss, constantly lamenting the absence of the warrior, her courage, her strength.
That's why he's a dog dragging a coffin: it's not just to symbolize Casca's suffering, the coffin symbolizes above all that Guts buried Casca like all the other members of the band because his fight against Griffith is about that: reminding him that Casca exists and that she was sacrificed and is also DEAD to this day.
Yes, Guts, who constantly saves Casca and does everything he can to ensure her survival, is constantly reminding her that she has disappeared within herself.
And the darker it gets, the more darkness surrounds Casca and, paradoxically, the more she regains her legitimacy, because she exists in darkness like all the members of the Troupe lost in Eclipse.
So when she sees Guts again, it's as if she's picking up where she left off: she suffers
She suffers in full consciousness
This time it's her mind that has to take the blow
Because she is once again part of this fight
Guts blames his sword for failing him, but he forgets that the weapon has always been Casca, and he will not succeed.
When Griffith gains the upper hand in his fight against Guts, it is symbolically by holding Casca: because it takes two to have the advantage.
Casca, whose existence was denied to the point of being deemed unworthy of sacrifice, gave birth to a fetus conceived through rape, which is the only means for her tormentor to materialize in this world that he should have left.
Her tormentor, who denied her existence, owes his material existence to her
And is now forced to see her
Casca is the key to preventing the merging of universes