The arcane sigil can be attached to a blessed spirit shield to make an arcane spirit shield. To attach the sigil to the blessed spirit shield, players need 90 Prayer and 85 Smithing. Smithing the shield gives 1,800 Smithing exp. Alternatively, players can ask Abbot Langley to attach it for 1,500,000 coins. It is a rare drop from the Corporeal Beast.
In a future update with the addition of the third raid, the arcane sigil will be able to be extracted from the arcane spirit shield by bringing it to Abbot Langley. This process destroys the blessed spirit shield and only returns the arcane sigil.
For an exhaustive list of all known sources for this item, see here
- ↑ OldSchoolRS. "The Launch of Combat Achievements." (1:54:44), Twitch.tv video. 31 July 2021."Introduced a feature on Abbot Langley to revert that process, destroys the blessed spirit shield, but you'll get the sigil back so you can attach it to the Ward of Elidinis."