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Volt Filament is a Blue tool that you can equip to your crest in Hollow Knight: Silksong. Check out how to get Volt Filament, its location, and its effects here!
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You can get the Volt Filament by defeating Voltvyrm in the Voltnest, located at the top-middle area of the Sands of Karak. The easiest way to reach this area is from Blasted Steps. Use wall jumps and the clawline to climb all the way up to the nest.
Voltvyrm is an optional boss that can be fought from Act 2, so make sure you’re prepared before challenging it.
Volt Filament can be used to add electric damage to Hornet’s Silk Skills. You can do this by equipping the Volt Filament in a slot in any of your crests.
The boss is also available on act 2