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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 can be received when cutting Crystal trees with a Crystal hatchet. It can also be obtained via pickpocketing the Hefin and Amlodd workers.

If a cleansing crystal is used completely, without interruption, it will provide 9,800 Prayer experience. This is a cost of 11.22 coins per experience. It takes two minutes to be fully used up. Up to 30 stones can be cleansed in an hour, providing around 294,000 experience an hour, at a cost of 3,300,000 coins.

Alternatively, when the voice of Seren is illuminating the Hefin district, a cleansing crystal will give 20% more experience, for a total of 11,760 experience. This is a cost of 9.35 per experience, providing 352,800 experience per hour at the same total cost.

The experience received can be increased with items such as the First age outfit.

It should be noted that there is no limit to the amount of experience you can gain here daily (except the physical limit of 7,761,600 experience in a day, assuming that for 12 hours of the day the Voice of Seren is active in the Hefin district and for 12 hours it is not). You can gain as much experience here as you can afford.

Coins per experience No bonuses With 1 First Age item 2 items 3 items 4 items 5 items
11.22 11.11 11 10.9 10.79 10.59
Voice of Seren VoS + 1 item VoS + 2 items VoS + 3 items VoS + 4 items VoS + 5 items
9.35 9.26 9.17 9.08 8.99 8.82
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November 10, 2014 +