Bungie has introduced a new material that players will need to Farm Called “Wormspore”. This new material is used to help upgrade Year two armor and weapons and is only available on the dreadnaught. In addition to Legendary Marks user will have to find the Best and fastest way to obtain Wormspore to upgrade legendary and Exotic taken King armor.
We are not sure if the wormspore material will operate the same way as other Farmed and collected materials or if it will only appear after a battle with thrall. But what we do know is that just like Legendary marks it is a key component to upgrades.