Dungeon Farming: Reborn as a Dungeon Lord, cultivating life inside a cave.

One day I woke up inside a cave.There were luminous crystals in the walls, one huge crystal in the center of the room and a collapsed tunnel leading to God only knows where.I tried digging the entrance but human hands are not exactly the best tools for digging and there were no other tools around, so after a few hours of useless efforts I gave up.Time passed and nothing changed, but instead of getting weaker and weaker with the passing of the time, I got stronger. I felt no hunger, no thirst, I didn't even get sleepy."Can somebody tell me what the heck is going on!?"And then, I got the answer.