The Hefin course multiplier is a token that increases the Agility experience received for traversing obstacles on Hefin Agility Course by 20%. The multiplier lasts for one full lap and consumes the item.
The experience multiplier from this item also applies to the Prayer experience gained when running the course while the Voice of Seren is active in the Hefin district.
Hefin course multiplier tokens can be obtained as an uncommon reward from a light creature after completing a lap on Hefin Agility Course, when pickpocketing Hefin workers or as a reward from exchanging 10 crystal motherlode shards with Wythien.
For an exhaustive list of all known sources for this item, see here
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