Bat bones

Bat Bones are a type of bone which are dropped by bats. These bones can be obtained by killing a bat or giant bat. Bat bones are also used to train the Prayer skill. When buried they give 5.3 Prayer experience, which is 17% more than normal bones (which give 4.5 experience). They became available to F2P after the Dungeoneering skill was released.

Members will need bat bones for some quests, including: Merlin's Crystal, Forgettable Tale of a Drunken Dwarf, and Watchtower.

Trivia
Mixing ground bat bones with a vial of water or a Guam potion during the Watchtower quest will cause a reaction. Mixing it with water will cause the potion to evaporate, while mixing it with a Guam potion or a jangerberry potion will cause it to explode!