Imagine yourself trapped in a dungeon. Now imagine you're alone and unarmed.
Awakening in stone cell, he has no memory of his past.
He is weaponless, defenseless, without spells, or even necessities such as food and water. Survival under such conditions would be difficult in any situation, but it's nearly impossible when monsters and other threats lurk around every corner. No fighter, no cleric, no ranger, or druid to assist him. A lone man against the darkness.
He must delve deep into the dungeon's hostile depths if he has any hope of escape, but no one leaves the dungeon unchanged...