From Guild Wars 2 Wiki
Spirit Threads are trophies which can be infused with the death of a Legendary Chak Gerent to create Energized Spirit Threads. Five Energized Spirit Threads are needed to make a Spirit Weave, required for the Envoy Armor I: Experimental Armor collection.“
— In-game description
- Found in Gorseval's Chest after defeating Gorseval the Multifarious. One Spirit Thread drops per chest.
- Each Spirit Thread needs to be individually infused with the death of one Chak Gerent; the meta-event does not need to be successfully completed.