With a request from @OmegaKrypton, who is my best friend (one of), I'm doing part 3 earlier.
The wall suddenly opened by itself and Cyrus saw a dark room at the end. Cyrus walked carefully along the pathway and arrived at a dark room. Inside the dark room, there were many electrical components. Cyrus was confused since he discovered these ruins in a primitive forest. He searched through the goods and found a hidden box. There was a cryptograph only with numbers next to it. Next to it were a bunch of letters...
OKrZnPtRbAs
Cyrus knew that it was a riddle again. Can you solve it for him?
Hints:
+-×÷
There is a hidden easter egg! Can you find it?