System Change - Chapter 487: Confrontation/Epilogue

... rek checked out the description for his new Achievement.

World Boss I

This Achievement (Title) is awarded for defeating the monster designated as a World Boss by a system. World Bosses are rare creatures that are known to devastate worlds if not defeated in a timely manner. These creatures do not appear often, and once defeated, do not respawn. It is impossible to know when a new creature capable of carrying the title ‘World Boss’ will appear again and receive the designation.