Frost dragon bones

Frost dragon bones are obtained from killing a Frost dragon. When buried, they give 180 Prayer experience each - this can be increased to 630 experience using a Gilded Altar in a player owned house with both burners lit. Frost dragon bones are the best bones in the game, giving 2.5 times more experience than dragon bones and 28.6% more than Ourg bones.

Trivia

 * They were 20,000 coins each on the Grand Exchange at the date of release.