Monsters wouldn't revive when there's someone present within their zone. This feature is taken advantage of by adventurers exploring the dungeon and setting up several "safe zones" on certain floors, easing the exploration of subsequent adventurers.
If the floor he was on was the 25th floor, then there should be at least three safe zones he could visit. Those points were his primary target.
"I have three health potions, two stamina potions, and five mana potions. Five Monster Repellant bombs, seven magazines for my pistol, and food and water for a week."
He organized his items carefully, planning how to use them.
"It was good that we split up the bare minimum of consumables in case we got separated." He chuckled, finding his paranoia to be helpful in his current plight.
After checking his inventory, he then pulled out his Adventurers Card and pondered how to distribute his newly gained stats.