Dragon bones may be a more economical choice when training Prayer, as each ourg bone is worth dragon bones, giving Prayer experience compared to the ourg bone's 140 Prayer experience. They give 490 prayer experience when used on a gilded altar with both incense burners lit, and 560 prayer experience when used with the Ectofuntus. It is advised to sell Ourg Bones that you get from an Ogre Coffin rather than using them because of their high price/experience.