Hence, the theories that once popped up about the dungeon 'taking away' skills were quickly debunked, even more so when the people who 'lost' their skills regained them some days later.
Thus, it was determined that through some means that had not been uncovered to date, Grimsgil's Dungeon 'Sealed Away' skills of its explorers/challengers.
From what Evan read in the Archive, each monster in the dungeon contained within their bodies, a strange type of energy that was imperceptible to most beings.
This energy was also omnipresent in the dungeon, and it permeated into the user's body right from the instant they entered the dungeon.
When the monsters of the dungeon came into contact with a dungeon explorer, they injected more of this energy into the explorer's body.