Sona Ability (LoL): Song of Celerity

Active: Sona begins a new Melody and grants herself 20% (+2% per 100 ability power) movement speed for 3 seconds, extended to up to 7 seconds if she doesn't take damage.

Melody: Sona gains an aura for seconds that grants allied champions 10 / 12 / 14 / 16 / 18% (+2% per 100 ability power) movement speed for 3 seconds.

Power Chord - Tempo: Power Chord also slows the target by 50% (+4% per 100 ability power) for 2 seconds.