The reason why the words DUNGEON RUINS are always spelled in all caps is so that everyone knows what you're writing about. No one has any clue how they got there, or how treasures seem to magically respawn every day as the layout of the dungeon changes or how no one ever dies in the DUNGEON RUINS. Anytime someone would "die" in the dungeon ruins, they simply just appear back in Battle City in a HUGE amount of pain, but alive. The DUNGEON RUINS are simply one giant, extremely profitable mystery. The treasures can range from tech to magic items, to expensive bottles of vintage wines, to any luxury you can fathom.