Quadraslash is a recurring skill in the series that has appeared in different forms in each game it has been featured in, but is always an attack of catastrophic power involving a gargantuan sword descending from the heavens to cleave through the target.
Quadraslash debuted in the series as a Co-op de Grâce that can be used if a Warrior or Ranger is in the party, and will target one enemy. The damage calculation is the sum of the party's attack stat minus the enemy's defence, and will ignore evasion. Due to the sky high damage the skill causes, it can pierce through a metal slime's defences.
The Luminary learns quadraslash through a plot point near the beginning of the game's second act at Angri-La. This involves a training battle with Rab, where in the Luminary must learn to channel the skill's power properly. Quadraslash must be used five times, dealing approximately 16, 32, 75, 150, and 300 damage until it is fully mastered.
When used in battle quadraslash deals non-elemental, strength-based damage to all enemies with a maximum potential range of 330~390 when the Luminary's stat hits 270. It costs 24 MP to use, and is one of the requirements for the Solar Flair pep power, along with Rab's Pearly Gates.