Berserker bones

Berserker bones are dropped by Wilderness Berserkers. The bones that gives 100 Prayer experience directly and after it's buried it will burn. While burning the player will receive 10 Prayer experience per tick for 6 seconds, resulting in up to 100 additional Prayer experience. This only happens when bones are not used on a altar or are cremated. In practice, this means that when the bones are buried outside of Wilderness, they provide a total of 200 Prayer experience.

In the Wilderness, the Prayer experience provided each tick during the burning duration is increased depending on where in the Wilderness they are buried. The experience per tick in the Wilderness is equivalent to (10 + Wilderness level), or 70 when burned within 10 squares from another Berserker, meaning that if the bones are buried at level 1 Wilderness the bones provide a total of 260 Prayer experience, whereas at level 56 Wilderness, the Prayer experience goes up to 760, and if buried near another Wilderness Berserker, the bones would provide would be a total of 800 Prayer experience.