After speaking to many NPCs many times, paying attention to paintings (like on the secret Abbey of the True Gun floor) and references made, the player may deduce that the Lich (as with most Liches in fantasy universes) was once a human seeking power. This boss is where Gungeon lore finally culminates.

The Resourceful Rat is one of the most difficult bosses to gain access to, but once defeated you will never need fear his thievery again. The fight is made up of three phases, all vastly different, culminating in a game called Punch Out! where the boss will drop items and some great guns to pick up. In order to even find him once you've gained access to his secret floor, the player must have all the notes to get through his maze. Though the Dragun or the Bullet King may technically rule the Gungeon, the Resourceful Rat is the one pulling the strings. This is one of those bosses that each player has a personal vendetta against, and so tracking him down and defeating him is very satisfying. Once the player has formed the Bullet That Can Kill The Past, a key to the Rat's lair becomes available to buy. Despite the Gungeon constantly shifting and reforming the Rat has found a way to navigate easily, and even has his own lair safely tucked away.

If you've ever left a room intending to come back for an active item or some ammo you don't need just yet, then returned to find a scribbled note instead, you've had the pleasure of meeting this boss already.

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