Cleansing crystal

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 coins each.

If a cleansing crystal is used completely, without interruption, it will provide 9,300 Prayer experience. This is a cost of coins per experience. It takes two minutes to be fully used up. Up to 30 stones can be cleansed in an hour, providing around 279,000 experience an hour, at a cost of coins.