Heartpiercer

Heartpiercer, Elite Shadow Warden, is a Phantom Blade Zero boss at the White Serpent House on Meigu Lake, behind a door that opens with the Loong Emblem from the Red Serpent House. Guard his blade streams, parry the blue kick chain and dodge the red-flash volleys and spinning rush. He drops the Sundering Dual Axes.

The Loong Emblem is the real first step: Heartpiercer, Elite Shadow Warden, crouches in a bamboo courtyard behind a lattice door at the White Serpent House on Meigu Lake that only that emblem opens, and once inside he falls to steady defense: guard his blade streams, parry the blue flashes and dodge the red ones. His Sundering Dual Axes are the prize, and he is one of the three wardens behind Steam's Three Wardens Fall, held by 34.8% of players on Nov 9, 2026.

He is a long fight rather than a wall. In Jake Baldino's Oct 26, 2026 gameranx video (10:43), the bosses deeper in the game turn "absolutely downright crazy" and "very challenging", yet never the kind of wall that makes you put a game down, and AllThings.how's Heartpiercer win bears that out: about 15 minutes 40 seconds on Wayfarer, with all three gourds spent.

Quick facts

Chapter	The Four Serpent Houses (Game8)
Required	A main story boss to Game8; "another pretty hidden boss" to PCGamesN
Key	The Loong Emblem, from the Red Serpent House in Crimson Forest
Health	115,200 HP on Pathbreaker
Rewards	Sundering Dual Axes and 140,000 Remnant Dust
Behind him	Serpent Slough: White, Leng Tu's Memory Flower (3) and the White Serpent Eye

Three Serpent Houses to open one door

Sail to the White Serpent House Dock, cross the bamboo yard and climb the stone stair to the White Serpent House bell; two White Shadow Wardens wait in the yard and one more by the bell. The carved double door a short walk on is locked. Maxroll's detour to open it: the Black Serpent House in the Village of Lu, then the Red Serpent House in the Crimson Forest, where you get the Loong Emblem. Back at the White Serpent House, unlock the door; Heartpiercer crouches in the middle of the courtyard, and walking up to him starts the fight.

Rest at the White Serpent House bell before opening the door, since a death returns you there. After the win, loot the house behind him, but Maxroll warns: "Do not return to the Green Serpent House!" It must be finished later in the story for the perfect ending (Endings, Missables).

Defense first, then damage

Hold your guard. Nearly everything he throws or swings, melee and ranged alike, can be blocked by Game8's reading: keep block up and wait for his combo-ender glints, then squeeze in a few hits to drain his stagger bar.
Guard every blade stream. In AllThings.how's run, guarding them cut what they cost over a whole fight from 719 HP to 70 HP.
Keep a Sha-Chi reserve. Most of the damage in AllThings.how's close losses came while Sha-Chi was under 100.
Drink a gourd at about 40 to 50% health, right after he finishes a long string or a throw, and treat every close hit as the start of a combo.
Stay close once he is staggered, to land more hits.
Bring damage. AllThings.how found a Sanguine Twin at level 14 (460 Damage) enough, a Dread Axe at level 12 faster, and a level 6 Sanguine Twin slow: about three minutes for 14% of his health. It paired the Resonance Talisman with Jewel's Knot+1.
On Pathbreaker his attacks hit about 40% harder than on Wayfarer, so dropping the difficulty is a real option if he walls you (Difficulty Modes).

Axes, blade streams and the spinning rush

Damage is AllThings.how's, on Pathbreaker then Wayfarer, against Soul at 1,402 HP.

Lunging axe slash: he surges from a crouch. Parry or sidestep; 200 / 140 HP.
Airborne blade stream: he vaults back after a melee strike and sends a stream of blades. Guard the whole time; 50 / 35 HP a blade, 245 to 315 for a full stream on Wayfarer.
Red-flash blade volley: a red flash at about 9 to 10 m, then spinning blades. It cannot be parried: dodge as they reach you. About 400 HP in five hits on Wayfarer. PCGamesN also says to dodge the spinning blades quickly.
Thrown blade into a dash: a throw from 8 to 11 m, then a dash. Parry it; 176 HP for both cuts on Wayfarer.
Red-flash spinning rush: a red flash, then a spinning charge. Dodge early, since it cannot be parried; 492 HP in all on Wayfarer.
Backflip and somersault: Game8 names a backflip with a red-glint attack, and PCGamesN warns of a red attack after his backward spin jump. When he leaps high over you, keep moving and watch where he lands.
Left-hand pierce: a swift red-glint thrust.
Jump kick into a blue spin: a Sha-Chi draining jump kick, then a blue-glint spin. Game8 says to dodge the kick, or parry the spin if you miss; AllThings.how says to parry each strike of the blue-flash kick chain.
Flank swipes: close cuts from your side. Raise your guard.

Back at the Soulrend Cliffs

The courtyard is not the last of him. Maxroll lists Heartpiercer and Cavalrybane, Elite Shadow Wardens as the second phase of the Meng Hua fight in the Soulrend Cliffs, and says to focus one down. The axes' lore line reads "A pair of deadly axes once wielded by Heartpiercer, Elite Shadow Warden", with the description "The shorter the blade, the greater the peril." They join the short-bladed end of Soul's arsenal on Weapons.