Chat am I cooking?

Cristoforo's ability is to create fake worlds based on scripts he writes. If certain conditions are met, he can invert the fake world and overwrite reality with it.

However, to write these scripts, he must use a powerful resonator as a medium—specifically, someone designated as the “protagonist.” (I suspect that early in the story, there's a device called the Incubator used to house the protagonist and maintain thefake world.)

At some point, Cristoforo encounters Mia, a strong but mentally burdened gladiator. He tempts her by saying that if she helps him, he’ll use his power to make her an invincible gladiator loved by everyone.

Most likely, he lured her in by promising to replace her with Lupa—essentially making her dream of being someone else come true.

Mia accepts and enters the Incubator, but Cristoforo has no intention of fulfilling her wish. Instead, he uses her as fuel to create a fake world where the Dark tide has destroyed Rinascita.

During all this, Mia is dreaming that she’s living as Lupa. That's why we are keep overlaping Lupa and Mia.

Now Cristoforo is planning to immediately swap the Dark tide-infested world with reality, giving no time to stop it, and unleash the Dark tide upon the real world.