When life and death depend on each other, when the two merge with each other, the world becomes chaotic. Chaos escapes, causing the destruction of the world. The new ones after the integration will eventually be unable to escape the catastrophes in this world, as well as their identities. Even if you don't want to admit it. There is no way to reverse it.
Things to note
(Fantasy text, there are male and female characters, fierce battles between female protagonists, and some battle scenes that boys like to watch. The female protagonist is not dependent on the male protagonist. There are many reversals in the plot, and there is something to think about.)
Purpose: Don't be immersed in pain forever
