The Cube Quest Walkthrough: Remnant Spark Cube Locations

The Cube is a compact fetch Tale in Phantom Blade Zero that pays out one of the best damage accessories in the game: the Remnant Spark Cube. It starts with a worried Fisherman in Myst’s Tavern, sends you across Meigu Lake hunting two missing companions, and ends with Myst herself reassembling an artifact “not of this world.” The reward raises the damage of every Phantom Edge you own. This walkthrough gives both fragment locations step by step; pair it with the Meigu Lake walkthrough for the boat routes between docks.

Quest type: Side Tale (Pangzhen quest giver, Meigu Lake objectives) | Reward: Remnant Spark Cube accessory | Region requirement: access to Meigu Lake and its boat.

How to Start: The Fisherman in Myst’s Tavern

Reach Pangzhen in the main story and descend into Myst’s Tavern (about 37 meters from the Myst’s Tavern bell). In the tavern basement sits a Fisherman fretting over two companions who sailed to Meigu Lake and never came back. Speak with him to log the Tale’s three objectives: find the two companions on Meigu Lake, return to the tavern with the news, and speak with Myst about the cube. You can sail to Meigu Lake as soon as the boat unlocks during the main quest there.

Fragment 1: Tenon — Blackwater Crew Dock Elite

The Tenon half drops from an enemy, not a chest — this is the companion who did not make it. Sail to Blackwater Crew Dock on Meigu Lake’s eastern side:

1. From the Blackwater Crew Dock bell, head east across the dock walkways; PowerPyx’s route crosses a zipline first.
2. Watch for green lights on the far side of the island. An enemy bursts out of a stack of boxes beside a small shrine — this is the elite carrying the cube fragment.
3. Defeat it and it drops Remnant Spark Cube Fragment: Tenon. The ambusher hits hard for an unremarkable-looking dock fight, so bring a weapon at your current material cap and keep a dodge ready for the box-opening lunge.

This dock sits beside the arena where you fight You Loong, the Frenzied Blackwater Crew Leader, so it is efficient to clear the Tenon fragment and the boss in one sailing loop; the fight and its Loong Trident reward are covered on the You Loong boss page.

Fragment 2: Mortise — Meigu Village East Dock Chest

The Mortise half sits in a chest on the central island at Meigu Village East Dock, roughly 61 meters from that bell and about 3 meters above dock level:

1. From the Meigu Village East Dock bell, take the stairs on the left, then climb the ladder to the island’s upper floor.
2. Drop down into the next room and open the chest to claim Remnant Spark Cube Fragment: Mortise.
3. The island is guarded — clear the fish-like enemies south of the locked central door first, and grab the Red-Cloth Door Key nearby if you are also clearing Meigu Lake collectibles. A corpse beside the route marks the second companion’s fate; the chest itself is unmarked, so navigate by the bell distances rather than watching for a glow.

Exact in-world coordinates beyond the bell-relative distances are community mapping in progress; the allthings.how interactive map pins the chest if you prefer a marker.

Repair Chain: Fisherman, Then Myst

With both halves in your key items, sail back to Pangzhen:

1. Report to the Fisherman in the Myst’s Tavern basement. Both companions are dead — the Tenon ambusher and a corpse at the Mortise site are what became of them — and telling him closes the investigation objective.
2. Speak with Myst upstairs, beside the Myst’s Tavern bell. Her examine-and-restore beat is the final objective: the two halves fuse into the finished accessory, and the Tale completes with the Remnant Spark Cube in your inventory.

Remnant Spark Cube: Stats and Polish

The Remnant Spark Cube is an Offensive accessory. Its card reads “Increases the damage of all Phantom Edges by 12%”, and full polishing raises that to 25% — verified by allthings.how. Two accessory slots are open from the start, so the Cube can sit alongside a second piece without any unlock grind. Because it buffs every Phantom Edge rather than one weapon, it slots into nearly every endgame build; compare it against the rest of the accessory pool on the all accessories page. To polish it, visit Jewel in the Village of Lu with Remnant Dust and the required crystal shard.

FAQ

Do you need to finish The Cube before the point of no return? Yes. Like every other Tale it fails once you cross the Mirage Estate threshold, and the Last Chance bell on Mount Soulrend seals the map. Finish it during your Meigu Lake chapter — the two fragment stops pair naturally with the dock bosses there.

Can you get the Remnant Spark Cube without the Fisherman’s quest? No. Both fragments only become meaningful through the Tale, and the finished cube is created by Myst at the final conversation. Starting the quest takes one conversation in Pangzhen, so there is no reason to skip it.

Is the Remnant Spark Cube worth using over other accessories? Yes, for any build that rotates Phantom Edges. A flat 12% to 25% boost to every Edge is the broadest damage bonus available on a single accessory slot; builds ignoring Edges should pick a more specific piece instead.

Sources

• Game8 — The Cube walkthrough and accessory data (quest steps, 12% effect line), October-November 2026.
• PowerPyx — Meigu Lake collectible locations (Tenon drop route past the zipline; Mortise chest route), October 2026.
• AllThingsHow — Remnant Spark Cube fragment distances and 12% to 25% polished values; Ultimate Talisman polish table for shard sourcing, November 2026.
• PBZ Builds — The Cube side tale guide (Jewel polish confirmation); GameHelpBase tales index and ShowGamer Meigu Lake walkthrough for the box-ambush and corpse confirmations.