The threat posed by the Abyssal Beast King was simply too significant.
Any act of resistance Vaan took would be insignificant and unable to change the outcome of his fate. Since Empyrean Oceanheart's divination determined that he was fated to die, the Lord of Chaos was very likely to arrive late.
In other words, he was very likely to die. Moreover, it would be a death truer than true death itself.
How in the world was he supposed to come back from that?
As Vaan sensed death's inevitable approach, he realized that he could not face it as calmly as he had imagined. Death was actually not new to him, considering the memories from his past reincarnations.
However, he had never experienced the concept of a truer death than true death.
Such a death wouldn't just be the annihilation of his body and soul but also the very essence of his existence and connection to the world.
