Lava dragon bones

Lava dragon bones are associated with the Prayer skill, and are dropped exclusively by Lava dragons. Lava dragon bones give ? Prayer experience when buried, ? Prayer experience when offered at the Ectofuntus, or ? Prayer experience when offered at a gilded altar with 2 burners lit.

When buried on Red Dragon Isle, they will grant you 3 times more XP than you would normally get for them.