You engulf your weapon in raging flames, empowering it with destructive fire aura. While this Technique is active, the weapon gains the Flaming Surge Critical Feature.

Flaming Surge
Critical Feature: If you roll 12 or more on a d20 during the attack check, the attack deals +1 Fire Damage. If you roll 18 or more on the d20 during the attack check, the flames erupt violently in all directions, dealing 1 Fire Damage to all enemies within 2 meters of the target.