Quick answer: Fine Thread is a pickup in Village of Lu near the Black Serpent House bell. It increases the damage and Sha-Chi depletion caused by summon objects by 50%.
Fine Thread is an Offensive accessory. It makes your summon objects hit harder and drain more Sha-Chi, and polishing it doubles that boost.
Where to find Fine Thread
Fine Thread item card: Effect and description
The item card lists Fine Thread as type “Offensive”. Its effect line reads “Increases the damage and Sha-Chi depletion caused by summon objects by 50%.”
The description adds some flavor:
“A bundle of fine thread spun from silk and silver thread. In ordinary hands, it’s little more than thread for mending clothes. But in the hands of a master, it can pluck a pearl from a table ten paces away without anyone ever noticing.”
How to polish Fine Thread
Polishing (refining) Fine Thread once changes its effect to “Increases the damage and Sha-Chi depletion caused by summon objects by 100%.”
- Polish 1 cost: 7,488 Remnant Dust plus a Tainted Crystal Shard
- Quick Hand Zhang sells a Tainted Crystal Shard for 7,440 Remnant Dust
To avoid paying Quick Hand Zhang, follow this guide to finding a Tainted Crystal Shard in the world. Polishing boosts the values but leaves the accessory’s function unchanged.
What Fine Thread is good for
Fine Thread’s bonus applies exclusively to summons: equipped summon objects deal 50% additional damage and Sha-Chi depletion, rising to 100% after polishing. If summons are part of your kit, track down the Incense Ash upgrade material for Summon Phantom Edge; you can also explore other damage-boosting options.
A Puppet’s Wooden Heart complements it by extending summon duration; this is another Village of Lu accessory. Three accessory slots are open from the start, so you can equip both at once. The full Phantom Blade Zero accessories list gives each accessory’s effect and location.
