This means that each boss' value is at least equivalent to a piece of Legendary equipment!
The previous routine of getting materials from the Blacksmith shop and the Underground City theoretically should have allowed all residents to own a set of epic Sky Sets. Now, the pathway to upgrade the epic sets to Legend sets has finally come to light, and the whole Underground City system has formed a complete equipment production chain.
If you're powerful and lucky enough, you can stay in Sky City indefinitely, without needing to venture out, and still own the best equipment!
Many people with online gaming experience can already imagine the degree of competition that each boss in the future Dungeons will face.