Fossilized Gun is a gun that fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil.
Cryptic Cryptids - If the player also has the Phoenix, both guns gain piercing and deal more damage, and Phoenix shoots rows of fire on the ground. The player is also immune to fire when either gun is equipped.
Dawn of the Gundead - Doubles the chance for Zombie Bullets to refund missed Fossilized Gun shots.
- The gun can be reloaded even if no ammo has been used; however, this is mostly useless as the fire spit can only ignite oil, and will not damage enemies or detonate barrels.
- With Bouncy Bullets, the oil stream will bounce and cover the whole room with oil, and can set the whole room on fire.