Let's rewind time a bit.
It happened the moment Alex, and they were about to engage the Elder Lich.
Strange things started happening everywhere in the dungeon. Monsters would indiscriminately attack everyone they saw; only a selected few were not attacked. The time for their respawn became almost automatic.
The group targeting Gracier had finally made a move; they were behind this dungeon's unusualness.
On the eighth floor, Leon's group was surrounded by a bunch of monsters, black goblins.
Boom!
After obliterating a group of black goblins, Leon sighed.
''Seriously, what up with this dungeon? Must something have gotten wrong? Maybe someone is behind what's happening? Either way, I need to search for my friend's sister and lovers quickly.''
Leon's group proceed to kill more monsters before trying to go down to the next floor.