Prayer
Prayer is a skill that allows that enchants the player with Buffs. Each buff provides their own unique trait that empowers the user.
The Skill can be leveled up with a few different ways: Burying Bones, using on the Dark Alters, Having the "Bonecrusher" (for Bones) or "Gilded Urn (for Ashes), or the Perks "Bonafide" or "Major Urner".
The best zone to get your bones for the training is Prayer Zone.