Dragon bones

Dragon bones are associated with the Prayer skill, and are dropped by all adult dragons. Dragon bones give 72 Prayer experience when buried (60 experience on RuneScape Classic), 288 Prayer experience when offered at the Ectofuntus, or 252 Prayer experience when offered at Gilded altar with 2 burners lit. The relative ease of collecting Dragon bones combined with the amount of experience earned from them makes them widely viewed as a fast, cost-effective way to train prayer. Free players can only obtain and use dragon bones, by killing Green dragons and Iron dragons in the Daemonheim dungeons. They cannot buy, sell or obtain any of these bones outside the dungeons of Daemonheim.

Members can also get Dragon Bones as a Reward from the Soul Wars Minigame by selecting the 'Gamble' option when choosing rewards. If a player gets Dragon Bones, they will likely be noted in 11 or 22.

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.

Tips

 * There are a wide range of Dragons that drop bones, including Green dragons, Blue dragons, Red dragons, Black dragons, Bronze dragons, Iron dragons, Steel dragons, Mithril dragons, Brutal green dragons, and the King black dragon. Most dragons are strong opponents. However, Green dragons and Blue dragons are the weakest types of dragons, and dragon bones are mostly accumulated by killing them.
 * Green dragons are the lowest level dragons in the game. They can be found in various places in the wilderness as well as in two locations in the Chaos tunnels. Green dragons in the Chaos Tunnels are grouped together with Baby black dragons, while players may be attacked by Player Killers while fighting Green Dragons in the wilderness locations.
 * The high value of dragons' drops (bones plus hides every kill for chromatic dragons) makes dragon-hunting a highly profitable combat activity. Players can make 300K to 800K coins per hour fighting Green dragons, depending on how fast they can kill the dragons and bank the bones and hides. About 125-150K can be made per run on dragons, and more if more valuable items are brought back as well.
 * Baby dragons do not drop dragon bones. Instead, they drop Babydragon bones.
 * Burying dragon bones is not recommended; usually they are best used on a Gilded altar.
 * Dagannoth bones, Ourg bones and Frost dragon bones are faster ways to train prayer than dragon bones, but cost much more per prayer experience point.
 * While Gilded Altars give the fastest experience by, some prefer to use Ectofuntus due to the fact that Gilded Altars give 36 less exp per bone; this both gives more experience, saving gold, and eliminates the need to obtain herbs and/or find a house party offering an altar.

Trivia

 * In Runescape Classic, Elvarg dropped dragon bones that F2P players could Telegrab once you defeated her. These bones were labeled as 'members object' and could not be used unless you were a member.
 * If a player were to start from level 1 Prayer, and bury dragon bones all the way to 200M experience, it would take 2,777,778 dragon bones to reach 200M, totaling a sum of approximately 0 coins.