Nunholy is an action roguelike where you play as a combat-ready nun on a vampire hunting quest through dangerous dungeons. The game's core mechanics revolve around a moral choice system where you can either absorb the dark powers of vampires to enhance your abilities or maintain your human purity by trading these powers to upgrade your gear. As you delve deeper into the dungeons, you'll encounter a hierarchy of vampire enemies, from knights to powerful dukes, with each rank representing an increasing difficulty. The dungeons are home to a variety of NPCs, including merchants, witches, prisoners, and undertakers, who offer trading opportunities to help you prepare for more challenging encounters. Your ultimate goal is to rise through the ranks of the hunter and earn the prestigious S rank by battling the most fearsome vampire lords.