Invulnerable while casting, but vulnerable towards the end.
At the start of the skill, Dacy runs around setting up her 6 dolls in a circle. During this time, she hits all enemies within the circle 3 times, for the listed damage.
After setting up her dolls, Dacy dances, hitting all enemies within the circle 8 times. The damage starts at thrice the listed damage, and increases by 0.3 times of the listed damage with every hit. The final hit deals 5.1 times of the listed damage.