RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Bat bones
The Old School RuneScape Wiki also has an article on Bat bones.

Bat bones are items you can bury for 4.5 Prayer experience. This is not the best way for training Prayer, Bats are higher combat than Chickens, and you get just a slightly higher prayer experience.

Bat bones can be ground with Pestle and mortar. Ground bat bones are used to create Ogre potions and Magic ogre potions.

During Merlin's Crystal one set of bat bones are dropped on pentagram to summon and vanquish Thrantax.

Dropped by: