Helium Filaments Destiny Buy 〈EXCLUSIVE | BREAKDOWN〉

You can no longer buy them to use for upgrades. Instead, any leftover stacks in your inventory can only be "sold" to at the Tower for small amounts of Glimmer. Historical Context and Usage

They were often sold in batches of for 1 Legendary Shard or 5,000 Glimmer . Current State (Deprecated) : helium filaments destiny buy

In their prime, Helium Filaments were more than just a currency; they were the "fuel" for progression. You can no longer buy them to use for upgrades