While you can no longer buy them for functional use, they remain a nostalgic symbol of the Moon's "grind" for veteran Guardians.
: In Destiny 2: Shadowkeep , players could use them to play a physics-based mini-game near Eris Morn on the Moon, which could even grant a hidden Triumph. helium filaments destiny buy
For several years, (at the Tangled Shore) and later Master Rahool (at the Tower) sold them as part of a daily rotating stock. While you can no longer buy them for