These skeletons can only be fought during the Demon Slayer quest. One is required to kill ten of them to prove to the Spirit of the Body that they are strong enough to wield Silverlight. Two of them would spawn, and three after you killed them, and the remaining five after you killed those. They should be easy even for very low-levelled players.
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- ninja 12 February 2018 (Update):
- Skeletons and cultists in the Demon Slayer quest no longer drop bones.
- Previously, they fire rocks instead of arrows, even though they can be seen loading their bow with arrows. This has since been fixed.