Dagannoth bones

Dagannoth bones are associated with the Prayer skill. They are dropped by Dagannoth Sentinels, Dagannoth Rex, Dagannoth Prime, and Dagannoth Supreme. Dagannoth bones give 125 Prayer experience when buried, thereby giving the seventh-highest amount of Prayer experience.

Dagannoth bones are also a possible reward from the gamble option in Soul Wars. One gamble will give you three to five bones.

Cost and XP Analysis
This table can be used to help the player with comparing and deciding on which of the various bones to use for the best balance in cost and XP. Notice how the cost in coins per XP point varies greatly depending on how the bones are used.

Trivia

 * Filling up on Dagannoth bones during a Dagannoth Kings trip helps to make the money back lost from equipment.
 * These bones can be used by wealthier players for power-levelling Prayer, as they can provide around 400,000 Prayer experience per hour.

Dagannoth Bones