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Medium enriched bones are obtained by using medium fossils obtained from Fossil Island and depositing them into the mycelium pool. Players must add pyrophosphite and calcite along with the fossil to calcify it.

They are then used on the eastern strange machine inside the House on the Hill for 1,000 Prayer experience.


  • Upon release, the medium enriched bone only granted players 200 Prayer experience. This was increased to 1,000 in an update on 18 January 2018.

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