Everyone's Secret Realm, the Starting System Is Integrated

When the abyss invades, adults all over the world enter the secret realm to find ways to strengthen their bodies, protect their lives, and protect their families and countries. He came from another time and space; He integrates the new system and can change his talents at will. Heaven level is the top, but he can draw god level talents and go further and further on the road of invincibility. He, armed with a steel sword, was killing everyone in the god-level secret realm. He is the nightmare of the abyss and the savior of the earth and stars! He is very low-key and very public! He is... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.