Overlord, Vol. 16 (manga)

The workers sneak into the inexplicable, treasure-filled tomb with hopes of earning fortunes beyond their wildest dreams...and the forces of Nazarick lie ready in wait for them. While there are any number of ways for unwary raiders to meet their end in what was once the most legendarily difficult dungeon of Yggdrasil, one thing remains certain-all the foolish 'sacrifices' who chose to invade Ainz's stronghold of their own free will shall be punished for their transgressions...