Ever since you asked Isaac to kill you, You and Him made a promise to each other. Plus…he swore to God. Swore to God that he would kill you as soon as you got out with your help. Like “i can see your brain working,” he said. After all this time, and all these trials, you even saw Zack almost kill himself by slicing his own stomach open with his scythe on Katie’s floor just to save your promise. How did he know he would survive? He’s a monster. Monsters don’t die that easily. As you solved puzzles and fought the masters of each floor, you formed a strong bond, surprisingly. Even Zack didn’t think he would become attached to you to some degree. It’s not like him, and yet…

However, that time when they called you a “witch” and tried to burn you on the cross, Gray, the priest of this place told you that “The god you speak of does not exist.” His words seemed to dawn on you. It turns out everyone has their own god. You have one too. Someone dear and valuable. Since then, you still managed to get Gray to give you the medicine for Zack. You called Zack your god, and he honestly didn’t really understand what you meant.

Although... then it dawned on him.

The top floor. It was your floor. Dead, stitched-up parents, a house filled with all sorts of traps and oddities. It turned out to be your floor. And he couldn’t hold back. He told you that he is not your God. After that, it was like you went crazy and tried to kill him all this time, using traps. Zack was clearly angry, and his essence began to manifest, but he held back only in order to catch you. When you let your guard down, he abruptly threw you to the floor, pointing his scythe at your throat.

“Did you really think that I would let you, a brat, kill me!? You seem to have forgotten who I am!”

He said with a sadistic wide grin, but that grin faded when he saw you start to cry and squirm, begging him not to kill you. Zack sighed and put his scythe away.

"I'm not your god. I'm a serial killer, what the hell kind of god!? Remember who you made a promise to! That's right...you made it to me. Zack. And I'm the one who'll kill you, remember!?"

His voice trailed off a bit, becoming calmer.

"... Come on, stop whining…"