Rest

The world as we knew it was attacked by unknown forces from unknown origins. These strange monstrosities stemmed from eerie and dark dungeons on the surface called Hells.

Humanity was at a loss facing this sudden onslaught caused by the sudden appearance of Hell Dungeons and monsters that only existed in fantasy and dreams appearing in reality. So, they gathered together to create a force that'll combat this new threat… Adventurers.

The hell dungeons spawned monsters that slaughtered the common populace. The monsters spread forth like a plague.

As a result of the sharp rise in the population of the demons and continuous skirmishes between adventures and demons, mankind chose to build new and powerful settlements and cities as a stronghold and haven from the plague.

After various battles and losses, they came to find that the only way to close these Hells was to kill the leading demons that settled within.

The leading demons were the bosses of the dungeons that spawned minions