All eight, and what each one is for

Dual-wield is the gauge type. Its combos run longest, which makes it the fastest way to fill a status meter — and the most punishing type to whiff with, because those same animations lock you in place.

Weapon Source Perk that matters
Sanguine Twin Weapon rack past Yu'er, Weeping Creek Valley None — the starting pair
White Serpent & Crimson Viper Beating Bai Chilian; received in Village of Lu Looping combo that escalates damage, plus ranged execution
Fiend Saws Mu Xiaokui's encounter, Village of Lu Fiend Form — 10 seconds of unblockable attacks
Parting Hooks Soulclaimer, northeast docks of Pangzhen Guard Stance: automatic block and counter
Sundering Dual Axes Heartpiercer, White Serpent House, Meigu Lake Baleful Aura, plus axes that latch onto enemies
Baishan Stormswords Yubi, No. 21 Swordfighter Puppet, Mandate Encampment Wind and thunder gauges combining into a damage window
Seamless Death Jade-Face, Mountain of Imprisonment Tracking rings thrown at range
The Lady's Fan Meng Hua, the final boss No documented signature effect

Where dual-wield wins and loses

Wins: enemies that reward sustained pressure — anything with a status gauge, and anything that punishes single heavy swings. Fiend Saws and Baishan Stormswords are the clearest examples: their whole design is "stay in contact and let the meter fill".

Loses: enemies with a raised guard. Dual-wield guard-break sits below two-handed, so a shielded enemy turns the type's long animations into a liability. That is the most common complaint about the type, and it is a matchup problem rather than a weapon problem.

The exception that proves it: Parting Hooks. It solves the commitment problem by refusing to attack on your behalf at all — you hold Guard Stance, it blocks and counters, and you only commit when the enemy is open.

The pairing that works

First slot Second slot Why
Any dual-wield blade A two-handed guard-breaker Covers the type's one structural weakness
Parting Hooks Your highest burst option Guard Stance creates the window; the partner spends it
Fiend Saws A ranged Phantom Edge Fiend Form is short — extend the pressure without closing distance

The ranged pairing is worth spelling out: Fiend Form lasts 10 seconds, so a bow or a cannon in the Phantom Edge slot lets you keep pressuring after it ends instead of walking back in.

Two fast blades in both slots is the mistake to avoid. It feels responsive and leaves you unable to break a guard, which is the one thing the type cannot do.

The full weapon table covers all 25 confirmed blades with source and effect, and the tier list explains why Parting Hooks sits in S while the rest of the type spreads from A to C.

What is not confirmed

Question Status
Damage and guard-break values per blade Published by community tables, not verified here
Whether The Lady's Fan has an effect Not documented
Whether upgrades change a perk or only its numbers Partly — new abilities at levels 5, 10, 15 and 25
Whether any dual blade has a hidden Soul Temper form No evidence

Sources