Wan Jun, the Coppermaul

Wan Jun, the Coppermaul is an optional Phantom Blade Zero boss behind a chained gate by the Beneath the Watchtower bell in the Mandate Encampment. Dodge sideways from his thrown dirt and his red-glint grab, punish him after his third ram and his spin, and he drops the Bashpole, the Phantom Edge that breaks wooden floors.

7:14 Wan Jun, the Coppermaul blinds you before he grabs you: in S-Game's Jul 28, 2025 demo walkthrough, a pre-launch build with no commentary, the pale giant swings a huge round-headed hammer around a fenced camp, at 7:24 a cloud of thrown dirt fills the screen with a red glint inside it, and by 7:44 he is down on the ground with Soul on top of him. In the released game he is an optional boss in a walled arena by the Beneath the Watchtower bell in the Mandate Encampment, and he drops the Bashpole, the Phantom Edge that breaks weak wooden floors. Its aerial slam is one of the least used moves in the game: 13.6% of Steam players had landed it (the achievement Heavenfall Strike) by Nov 9, 2026, fewer than for any other weapon or Phantom Edge achievement except Perfectly Linked, at 11.3%.

Quick facts

Where	Behind a chained gate near the Beneath the Watchtower bell, Mandate Encampment
Chapter	No chapter number in the guides; the Encampment opens once Gu Wanyue falls in Pangzhen
Required	No
Enemy type	Perfect Transcension
In the demos	Wan Jun "Coppermaul" on the 2025 S-Party demo's boss bar, and the Tokyo Game Show 2025 demo's boss
Needs	The Dread Axe to cut the chains, from Peng Meng

The chained gate by the watchtower

You need two things from earlier chapters: the Encampment itself, which stays shut until you take its key from the well Gu Wanyue retreats into (KeenGamer), and Peng Meng's Dread Axe. In the Encampment, cross the large battlefield and light the Beneath the Watchtower bell; the arena is behind a chained gate beside it, which the Dread Axe cuts open. Maxroll places the bell after the Corpse-Eating Xue graveyard and calls the gate a chain wall. Inside the arena, KeenGamer says to light the Main Encampment Gate bell before you leave.

Slow swings, hard landings

Dodge first, damage second. Maxroll: he attacks slowly, but each hit lands hard, so prioritize dodging, and stay off the walls, where you can get stuck.
Punish his recoveries. KeenGamer says to dodge or deflect his combos and attack once he finishes one, and to keep enough stamina for his slams and sweeps.
Drain his Sha-Chi. KeenGamer recommends the Scarlet Wraithblade, whose red lilies drain a boss's Sha-Chi quickly (it comes from Hua, Deadly Betrothed). Once his guard breaks, spend your strongest attacks.
Play safe when you cannot see. If his dirt blinds you, defend: he keeps attacking and can still grab.

Dirt, rams and the grab

Thrown dirt: he flings dirt straight ahead to cover your view. Game8 says dodge sideways; PCGamesN warns that when sand covers the screen, a red attack is about to come, so dodge away.
Grab: he throws one hand behind him and a red glint appears. Dodge at once; it cannot be blocked.
Ramming charge: wait out the first two rams and stay close on the third. He stumbles at the end, a large damage window.
Spinning hammer attack: stay close and block or dodge each hit; he stumbles afterward, a free window.
Leap onto his back: when he jumps up to land on his backside, dodge away, then attack while he lies on his back.
Hammer pushed along the ground: PCGamesN says to dodge away.

IGN, which fought the same boss in the Tokyo Game Show 2025 demo, described the dirt covering the screen before he grabs Soul and crushes him, and the 2025 S-Party demo already gave the Bashpole for beating him (Demo).

The Bashpole and the floors it opens

Beating him grants the Bashpole automatically. Its Groundbreaker ability breaks wooden planks over sealed floors even when it is not equipped, so earlier areas such as the Crimson Forest are worth revisiting, and it is especially strong against shielded enemies. KeenGamer lists its upgrades as Skyfall Bash at level 5, Forceful Interrupt at 10, Seismic Impact at 15 and Follow-Through at 25, and the Soul Tempering art Whirling Advance for 1 Pigeon Feed and 5,000 Remnant Dust. It is on Phantom Edges.