Prayer is a combat skill that may grant he or she a buff in combat. All players start with limited access to the Prayer skill. As a player advances their Prayer level , they gain access to new prayers. It allows players to pray for assistance in combat, such as, stat boosts and immunity from attacks. Effects last until the player runs out of prayer points, or a player turns their prayers off. Can also be used to repair or bless Gravestones. With a higher level a player can also wear Spirit Shields, including the Blessed variations.
Types of bones Notes
Bones A very common bone to see,  most of the npcs in Onyx drop it.
Wolf Bones Wolves on white wolf mountain drop these always, you can also buy them from summoning shop.
Big Bones All giants(like cyclops) and other large monsters.
  Ourg Bones General Graardor.
Dragon Bones Dragons.
Lava Dragon Bones Lava Dragons.
Superior Dragon Bones Adamant Dragons, Rune Dragons.
Dagannoth Bones

Dagannoth Sentinels.

Types of ashes Notes
Impious Ashes Dropped by low level demons such as imps
Accursed Ashes Dropped by mid level demons, such as lesser and greater demons, and fungal magi
Infernal Ashes Dropped by most high level demon type monsters such as Abyssal demons, black demons, Skotizo, Cerberus (can drop 50 noted as well), Nechraeyl and Zammy Boss

How to train Prayer Edit

You can train prayer in a number of fashions. The most popular being usage on the gilded altar. This method gives you 350% increased xp from standard burying xp. Another is the ectofunctus which is very unused as it's terribly slow, but it increases xp by 450%.

A new method recently introduced was by the usage of the level 33 chaos altar in the wilderness. It can save a bone at a 50% chance. Using this altar is just slightly better then using a gilded altar with its base xp rate. Saving a bone is basically doubling how much xp you get per bone.