Quick answer: Soul Temper the Sanguine Twin with the Chaos Twin Daggers and 5,000 Remnant Dust at Myst in Pangzhen. The Sanguine Twin then becomes Shadowless Edge.
The Sanguine Twin’s own card points to this upgrade. Its text reads:
“Transformed through Soul Tempering into Shadowless Edge.”
What you need for Shadowless Edge
- The Sanguine Twin, the weapon that gets transformed
- The Chaos Twin Daggers, used as the Soul Tempering material
- 5,000 Remnant Dust
- Access to Myst in the Order’s tavern in Pangzhen
The Sanguine Twin is a dual-wield weapon. The full set of dual-wield options appears in the Phantom Blade Zero weapons by type list.
How to get Shadowless Edge
Find the Sanguine Twin on a rack at the base of the ladder cliff, below the First Meeting with Yu’er bell. Follow the route in the Sanguine Twin location breakdown.
Put together the Chaos Twin Daggers using two components. A Lóng Pillar trial rewards Chaos Iron Fragment I, while the Aberrant Three-faced Puppet in Triple Threat drops Chaos Iron Fragment II. The Chaos Twin Daggers walkthrough covers where to find each fragment.
Go to the Order’s tavern in Pangzhen and talk to Myst. From her talk menu, choose “Soul Temper”. The full process is laid out in how to Soul Temper.
Press P on the upgrade screen to open Soul Tempering, then choose the Sanguine Twin from the weapon list.
Pay 5,000 Remnant Dust and the Chaos Twin Daggers to confirm. Once you do, the Sanguine Twin is replaced by Shadowless Edge, which brings the moves Shadow Form and Phantom Requiem.
Once you confirm, the Sanguine Twin is replaced by Shadowless Edge. That change in your weapons is how you know the Soul Tempering went through.
