Monsters only live in dungeons. That is what everyone thought.

In a small dungeon far away from civilization, there is a lone skeleton. It only knows how to dig the earth and to attack any intruders that come into its territory. When the skeleton discovers a strange floating sphere, it ends up destroying the dungeon by pure chance. It means that the skeleton's job to protect the dungeon is over, but its epic adventure is only beginning...

System Message:

[Seal has been destroyed. Level Cap removed]

Notes:

-This is a LitRPG. Shows Levels and Skills.