Karl has found himself trapped in Luvania, a vast underground city constructed by a vanished civilization, and the reasons for his imprisonment remain shrouded in mystery. Although his basic combat training gives him some fighting ability, the indescribable mechanical sentinels patrolling the tunnels demand more than brute force. Karl must scavenge elemental cubes from his surroundings and engineer makeshift traps to neutralize threats and carve a path forward through this enigmatic subterranean world.