: Described as filaments of helium-3 fusion fuel, they were canonically gathered from lunar regolith and used to power everything from individual fusion rifles to the Last City itself.
In their prime, Helium Filaments were more than just a currency; they were the "fuel" for progression. helium filaments destiny buy
The methods for buying these filaments shifted significantly over the franchise's history: : : Described as filaments of helium-3 fusion fuel,