Yuumi Ability (LoL): Prowling Projectile

Yuumi summons an errant missile that deals 60 / 90 / 120 / 150 / 180 / 210 (+20% of ability power) magic damage to the first enemy and slows the target for 20%, decaying over 1 second.

If cast while attached, Yuumi can control the missile using her mouse for a short period before it accelerates in a straight line. The accelerated missile deals 80 / 140 / 200 / 260 / 320 / 380 (+35% of ability power) magic damage and slows the target for 55 / 60 / 65 / 70 / 75 / 80% for 2 seconds, instead.

Best Friend Bonus: Prowling Projectile's slow will always be enhanced and hitting an enemy champion also grants them 10 / 12 / 14 / 16 / 18 / 20 (+10% of ability power) magic damage on-hit for 5 seconds. The bonus on-hit damage can be increased by 0-75% depending on her ally's critical strike chance.

Cost: 50 / 60 / 70 / 80 / 90 / 100 mana.