Hyakki Castle takes the dungeon crawler formula and infuses it with tons of creatures from Japanese folklore. If you already have the game, then get ready for some free DLC which will soon be downloaded to your copy.

The upcoming dungeon map is titled "The Last Fight with Domain" and can only be unlocked once you've beaten the main story. As such, it's basically a boss rush where the bosses have gained brand new attacks.

"The Last Fight with Domain" will become available on December 21 in a free update on Steam.