This is the translation:

Launches 3 Rainblades and 1 Stygian Resurge successively, dealing at most Lightning DMG equal to 223% (446%) of Acheron's ATK to a single target enemy, and dealing at most Lightning DMG equal to 180% (360%) of Acheron's ATK to other targets.

Rainblade: Deals Lightning DMG equal to 14.4% (28.8%) of Acheron's ATK to a single target enemy and removes up to 3 stacks of Crimson Knot from them. When Crimson Knot is removed, immediately deal 1 instance of Lightning DMG equal to 9.0% (18.0%) of Acheron's ATK to all enemies. Each stack of Crimson Knot removed will increase this DMG multiplier up to 36.0% (72.0%).

Stygian Resurge: Deals Lightning DMG equal to 72% (144%) of Acheron's ATK to all enemies and removes all stacks of Crimson Knot.

During the Ultimate, Crimson Knot cannot be inflicted on enemies.