The arcane capacitor (c) was a charged version of the Arcane capacitor amulet (u), obtained from Livid Farm for 18,000 produce points. This item was required for the use of the level 99 Lunar spell Borrowed Power. The player could only possess one at a time, and it degraded to dust after 1,000 uses.
The amulet could be charged with the runes for 1,000 casts of a spell from the list below (elemental staves could not be used). Once charged, the only way to remove the charges was either by using them or by selecting the "Remove-charge" option. The amulet was then destroyed, although any unused runes were refunded.
Other alternatives to Borrowed Power already existed, such as Spellbook Swap which has a slightly lower Magic requirement of 96, does not require any Produce Points in order to be used, and is not restricted to a selected amount of spells like Borrowed Power.
The arcane capacitor could be charged with 1,000 charges of the following spells:
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- High Alchemy, Bones to Peaches, Teleport to House, Vulnerability, and Slayer Dart were added in an update on 31 August 2011.
- On 23 October 2017 all instances of arcane capacitor (c) were converted into disused arcane capacitor (c), with all the charges moved to the Borrowed Power spell itself.