My Devil Man System

Amon was a Class C raider with the ability to repel and cancel any ability. One day he saw a peculiar gate and decided to enter it. But after he entered he saw a giant devil-like creature sealed in giant crystal. He accidentally touches the crystal and wakes up the devil-like creature. The Devil killed Amon to be his new body to inherit with, but he failed to transfer his soul to the body of Amon. Amon got the power of the devil and has the authority to use the devil's power.