Dwarf Fortress, obviously.

I once modded Skyrim to make hunger, thirst, sleep, wounds, infections, and weather as realistic as possible. Then, from nothing, set out to go dungeon diving. My guy had heard there were untold riches, and being dirt poor, it was going to be his ticket out of squalor. The amount of preperation that was needed took days. I had to build a small camp outside the entrance, catch kill and prepare foods that wouldn’t spoil. Make water skins to store enough water. I may be down there for weeks! Finally ready to go in, I have no idea what to expect, only rumors. It’s very dark (mod), but I made torches. Surprise Frost Troll. Dead. Bethesda update corrupted my modded save, but that’s ok, just another death of no one special in the frozen lands.

They were based off of William Shatner’s TekWar series of books. My uncle gave me a few and I tried reading them. Just imagine Tek Jannsen, but without any of the humor.