The Comprehensive Guide
Mastering the Prayer Skill in Old School RuneScape
In Old School RuneScape (OSRS), your combat prowess is ultimately defined not by your armor, but by the gods you pray to. The Prayer skill unlocks "Protection Prayers," which completely negate inbound damage from certain combat styles, and "Offensive Prayers" like Piety, Rigour, and Augury, which multiply your damage output dynamically. Reaching high Prayer levels is not optional for endgame content—it is mandatory. The Free OSRS Prayer XP Calculator maps out the grueling, expensive road to 99, ensuring you don't overspend a single Gold Piece on your journey to salvation.
The Anatomy of Prayer Experience
Unlike gathering skills where you chop trees or hit rocks, Prayer experience is derived almost entirely from processing loot drops—specifically, the bones and ashes dropped by slain monsters. The core logic of the skill is simple: you acquire bones, and you offer them to gods. However, the exact XP you receive depends entirely on where and how you offer them.
Every bone has a Base Experience value. A standard Bone gives 4.5 XP. A Big Bone gives 15 XP. A Dragon Bone gives 72 XP. A Superior Dragon Bone gives 150 XP.
If you click "Bury" on a Dragon Bone while standing in a bank, you receive exactly 72 XP. This is considered the worst possible use of resources in the entire game. To efficiently train Prayer, you must multiply this base XP using various religious focal points across Gielinor.
The Pillar Locations: Multipliers Explained
1. The Player-Owned House (POH) Gilded Altar (350% XP)
At level 75 Construction, players can build a Gilded Altar in their house chapel. When flanked by two lit incense burners (requiring marrentill herbs and a tinderbox to light), this altar provides a staggering 3.5x multiplier to any bone offered to it.
A Dragon Bone, normally 72 XP, suddenly yields 252 XP. The standard method involves taking noted bones to the town of Rimmington, using the NPC "Phials" to un-note them for a small fee, and running into a host's open house on World 330. You then manually use the bones on the altar, teleport outside, un-note, and repeat. This method is incredibly safe, fast, and mathematically consistent.
2. The Wilderness Chaos Altar (Effectively 700% XP Yield per Bone)
Located deep in Level 38 Wilderness, the Chaos Temple houses an altar that functions identically to a lit Gilded Altar (3.5x base XP). However, the Chaos Elder presiding over the temple offers a dark blessing: every time you offer a bone, there is a 50% chance the bone is not consumed, while still granting the XP.
Statistically, this means 1,000 bones acts like 2,000 bones in your inventory. You are effectively doubling the XP value of every GP you spend on the Grand Exchange. A Dragon Bone here effectively yields 504 XP on average across a large sample size. The catch? It is a multi-combat PVP zone. Player Killers (PKers) constantly patrol the temple. If you die, any items not protected upon death are lost. Players learn to bring bones in small batches, un-noting them at the nearby NPC (Elder Chaos Druid), effectively minimizing risk while reaping apocalyptic rewards.
3. The Ectofuntus (400% XP)
Located in Morytania, the Ectofuntus grants the highest raw multiplier in the game: 4x base XP. A Dragon Bone yields 288 XP. However, to use it, you must grind the bones into bonemeal using a machine, travel below the temple to collect buckets of ectoplasm, and use both items on the central fount. Due to this incredibly slow process, the Ectofuntus is almost exclusively used by extreme budget accounts or Ironmen who need to squeeze every drop of XP out of their limited bone supplies.
Alternative Pathways: Reanimation and Slaying
Ensouled Heads
Monsters like Goblins, Bloodvelds, Abyssal Demons, and Dragons occasionally drop "Ensouled Heads." By wielding the Arceuus Spellbook, players can use the "Reanimate" spells on the Dark Altar to bring these heads briefly back to life. Killing the reanimated creature yields immense Magic and Prayer experience.
For example, reanimating an Ensouled Dragon Head grants a flat 1,560 Prayer XP. This method bridges the gap between passive magic training and active prayer training. While it requires clicking and combat engagement, it is often vastly cheaper per-XP than buying equivalent dragon bones on the Grand Exchange.
Passive Acquisition (Bonecrusher & Arceuus Offering)
Training Prayer doesn't always have to be a dedicated grind. When training the Slayer skill, players can equip the Bonecrusher. This mystical item automatically grinds up bones dropped by your kills, granting half (or full, with diaries) the bury XP passively. Over hundreds of hours of Slayer training, this results in millions of "free" Prayer XP.
Furthermore, using the Arceuus spellbook's Demonic Offering and Sinister Offering allows players to instantly consume ashes (like from Nechryaels) or bones lying on the floor in a 3x3 radius, granting 300% of the base XP instantly without banking.
How to Plan Your 99 Prayer Grind Effectively
The OSRS Prayer Calculator allows you to navigate the constantly shifting economy of RuneScape. When deciding how to train, you must balance your IRL time versus your in-game wealth.
- Ask yourself: Do I have a high capacity to make GP (e.g., farming high-level raids)? If yes, use the Gilded Altar with Superior Dragon bones. Your time is worth more than the gold you save at the Chaos Altar.
- Are you on a tight budget? The Chaos Altar with Wyvern or standard Dragon bones will save you tens of millions of gold. The time lost dying to PKers is heavily outweighed by the 50% bone preservation mechanic.
- Are you an Ironman? Check the calculator for the Ensouled Heads section. Often, the heads you passively stacked up in your bank over months of Slayer will push you from level 60 to 70 without requiring you to camp green dragons for a week.
Use the calculator daily to check the GP/XP ratio of different bones. Often, neglected bones like Lava Dragon Bones or Drake Bones will crash in price, offering previously undiscovered efficiency routes. May Saradomin (or Zamorak) bless your gains.