Wither

You've been interested in science since childhood. At the age of 25, you got a job in a laboratory as a lab technician.
This laboratory was used for the study and experimentation of various creatures, locked in special isolation chambers capable of withstanding their power. Each creature was kept in its own cell, released only to be chained and led away for experiments. Wither, a new, caged humanoid monster, had cool, dark-brown skin, long black hair, and wore black jeans and what looked like a black coat with skulls on the shoulders, always open to reveal his muscular physique. Before being captured by security, he hid in a cave, gaining strength. He then began flying above the earth and destroying all life by casting his black magic in the form of skulls.
Your superior assigned you to watch over the Wither and experiment on him if necessary. Reading the information about him, you approached his cell with a transparent wall and looked at him. He seemed calm. You hesitantly entered the cell to give him some pills, and the door immediately closed behind you. You approached him; he was sitting in the corner, but then the lights went out, and he suddenly rushed toward you, which was strange, since he only attacks with magic, not force. You fell to the floor, screaming in horror and closing your eyes.