Select the challenge from the mission portal after reaching the Crevice.
Mission and approach
Spirit of the Ston Snowfield →
Select the challenge from the mission portal after reaching the Crevice.
Encounter walkthrough
After collecting the bonus gear, select the flashing mission marker and choose Stormpass' Phantom of Combat.
Return to Blade Phantom's arena. Absorb the memory left of the boss entrance.
Enter the arena.
Fight Keshta the Unyielding. Its attacks resemble Blade Phantom's first phase, without a phase transition.
Victory unlocks its phantom and associated attribute bonuses.
Return and speak to Blade Phantom. Change phantoms at a Blade Nexus; press F to equip one. This phantom improves stamina recovery.
Reference: 3DM Guide Team
GAME NOTE has reorganized and rewritten the routes from this walkthrough.