Cleansing crystal

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Cleansing crystal detail.png

A Cleansing crystal is an item used to cleanse the Corrupted Seren Stone in the Hefin cathedral in Prifddinas. It can be purchased from Hefin monks for 110,000 coins each or obtained via pickpocketing the Hefin workers. The store refill rate for cleansing crystals is approximately 1 every 10 seconds with a maximum store quantity of 30 of them.

If a cleansing crystal is used completely, without interruption, it provides 9,800 Prayer experience. This is a cost of 11.22 coins per experience. It takes two minutes for a crystal to be fully drained. Up to 29 can be used in an hour, providing approximately 284,200 experience per hour, at a cost of 3,190,000 coins.

When the Voice of Seren is illuminating the Hefin Clan district, a cleansing crystal gives 20% more experience, for a total of 11,760 experience. This is a cost of 9.35 coins per experience, providing 341,040 experience per hour at the same total cost.

Cleansing one crystal completes the hard Tirannwn achievement A Clean Slate. Ten cleansing crystals are granted upon completion of the elite Tirannwn achievements. Fully using a cleansing crystal is a possible skill riddle challenge during a Master clue scroll.

Prayer XP[edit | edit source]

Experience is gained during three phases in the following amounts (Voice of Seren in parentheses):

  • 2,100 (2,520) immediately when starting to cleanse a crystal
  • 19 chunks of 275 (330) every 6 seconds while cleansing, starting 3 seconds after the initial experience
  • 2,475 (2,970) when finishing a crystal, 3 seconds after the final small chunk of experience

An additional 5% experience can be gained if under the effects of a perfect juju prayer potion or perfect plus potion. The experience received can also be increased by wearing the first age outfit and activating the salvation, corruption, or harmony auras. Generic experience boosts (including bonus experience, clan avatars, and the wisdom, enlightenment/illumination, and festive auras) also boost experience as expected. Unlike other special Prayer training methods, such as offering bones or ashes on player-owned house altars, the experience gained from cleansing crystals can be doubled during Double XP Live.

If a crystal is fully cleansed while wearing the Tirannwn quiver 3 or 4 and there are more crystals carried in the inventory, the next crystal will automatically be used to continue cleansing. This can lead to training with minimal interaction, if large numbers of crystals are bought in advance.

The player should be careful when clicking while a cleansing crystal is being used. If a mis-click or other action occurs that may interrupt the process, the crystal will vanish and the player will not gain the remaining experience. Clicking the crystal while cleansing will end the cleansing process. One can chat, rotate the camera, and use most interfaces without interrupting the process. Drinking a perfect juju prayer potion (or perfect plus potion) or equipping the Tirannwn quiver from the inventory will interrupt the process; however, performing these actions from the action bar will not. Incense sticks can also be lit from the task bar.

An alternative method of using crystals is to repeatedly restart the cleansing process for the initial experience only. With this method, there are 5 ticks (3 seconds) between each crystal being consumed, giving 2,100 experience each. At maximum speeds, this results in a maximum of 1,200 crystals consumed per hour, giving 2,520,000 experience per hour (excluding experience boosts) at a cost of 132,000,000 coins per hour (52.38 coins per experience). During Hefin Voice of Seren, this increases to 3,024,000 experience per hour (excluding other experience boosts) (reduced to 43.65 coins per experience).

Cost and XP analysis[edit | edit source]

Coins per XP No bonuses With 1 First Age item With 2 First Age items With 3 First Age items With 4 First Age items With 5 First Age items
−11.22 −11.11 −11 −10.9 −10.79 −10.59
With Voice of Seren With Voice of Seren + 1 First Age item With Voice of Seren + 2 First Age items With Voice of Seren + 3 First Age items With Voice of Seren + 4 First Age items With Voice of Seren + 5 First Age items
−9.35 −9.26 −9.17 −9.08 −8.99 −8.82

Drop sources[edit | edit source]

For an exhaustive list of all known sources for this item, see here.

Store locations[edit | edit source]

This is an auto-generated list (update now). For a full list, see here. For help, see the FAQ.

Achievements[edit | edit source]

  • A Clean Slate (RuneScore.png 15) – Cleanse the Corrupted Seren Stone with at least one crystal.

Update history[edit | edit source]

This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!
  • ninja 3 August 2020 (Update):
    • The amount of Cleansing Crystals available from Hefin Monks has been increased from 5 to 30. These will still restock at the same rate as before.
  • ninja 5 January 2015 (Update):
    • Cleansing crystals are now a bit cheaper and offer slightly more Prayer XP.
      • Before this update, the cleansing crystal cost 130,000 coins and provided 9,300 experience.

Trivia[edit | edit source]

  • When a player switches equipped items while cleansing crystals, the progress bar will continue to advance, but no experience will be gained.