Yuumi fires a missile that deals 40 / 65 / 90 / 115 / 140 / 165 (+45% of ability power) magic damage to the first enemy hit. If the missile is in flight for 1 second, it instead deals 50 / 85 / 120 / 155 / 190 / 225 (+65% of ability power) magic damage and applies a 20 / 32 / 44 / 56 / 68 / 80% slow to enemies which decays over 1.5 seconds.

If Yuumi is Attached, she fires the missile from her ally's position and can direct the flight of the missile for up to 3 seconds.