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By · Updated 2026-11-03

Phantom Blade Zero Remnant Spark & Spark Cage: Locations and Upgrades

Remnant Sparks are the charges your Phantom Edges run on. More Sparks means more Phantom Edge uses per fight. This page explains how to get the Remnant Spark Cage, what polishing it costs, and how to raise your maximum Spark count.

Last checked: November 3, 2026. No late-game spoilers.

What Is Remnant Spark?

Remnant Spark is the resource you spend to use Phantom Edges, the limited-use secondary weapons you carry next to your two main weapons. Each use costs Sparks, so the number of Sparks you can hold limits how often you can bring out a Phantom Edge.

Ways to get Sparks back or save them (reported)

Each of the effects below comes from a single source:

Where Is the Remnant Spark Cage?

The Remnant Spark Cage is a Legendary Support accessory. It’s in a Major Chest in the Village of Lu, roughly 28 m from the Smuggler’s Treasure Cellar bell. Once equipped, Phantom Edge follow-ups have a 33% chance to give back one Spark.

Spark Cage Polishing Costs

To polish, rest at any Bell, open Upgrade Equipment, then choose Polish Accessory. One source says the option opens after Jewel in the Crimson Forest polishes your first accessory.

StepRefund chanceRemnant DustMaterial
Base33%––
166%12,480Tainted Crystal Shard
2100%18,720Refined Indigo Crystal

Two polishes take the refund chance to 100%, at a total cost of 31,200 Remnant Dust plus the two materials.

Where to get the materials:

Polishing in later Cycles

New Game Plus unlocks six more steps (3–8). Each one keeps the 100% refund and adds +5% max Sha-Chi, up to +30%. All of them use Refined Indigo Crystal:

StepRemnant Dust
337,440
456,160
574,880
693,600
7112,320
8131,040

More on Cycles: New Game Plus: What Carries Over.

Maximum Sparks: Still Depths

The Still Depths ability is the only known way to raise your maximum number of Remnant Sparks:

AbilityEffectRemnant Dust
Still Depths Lv. 1+1 max Spark30,000
Still Depths Lv. 2+1 max Spark60,000

Both levels together give +2 max Sparks for 90,000 Dust. Our sources don’t state the starting maximum, so we can’t give the final total yet.

Paying for It

Both upgrades together cost 121,200 Remnant Dust (90,000 for Still Depths and 31,200 for the first two Cage polishes), before materials. That’s a lot, so follow our Remnant Dust farming route to collect every one-time Dust source.

FAQ

Where do I find the Remnant Spark Cage?

In a Major Chest in the Village of Lu, about 28 m from the Smuggler’s Treasure Cellar bell.

How do I get more Remnant Sparks?

Train both Still Depths levels; each adds +1 max Spark.

Is the Spark Cage worth polishing?

If you use Phantom Edges a lot, yes. After two polishes, every Phantom Edge follow-up refunds a Spark.

Sources

Only facts were taken from these sources. All wording is our own.