Sona's basic abilities use the stance mechanic. In addition to their activation effects, her basic abilities each grant a unique and persistent aura until she activates a different basic ability to change stance. The previous aura persists for 1 more second after Sona enters a different stance. Changing stances sets off a 0.5 second cooldown on Sona's basic abilities.
Power Chord
After 3 ability casts, Sona's next basic attack will deal 8 + (10 × level) bonus magic damage, with an additional effect depending on the last basic ability cast.
Hymn of Valor
Range: 700
Cooldown: 7
Cost: 45 / 50 / 55 / 60 / 65 mana
Activation: Sona sends out bolts of sound that deal magic damage to the two nearest enemy units within range, prioritizing champions.
Activation: Sona heals herself and a nearby allied champion with the lowest health percentage, granting both of them bonus armor and magic resistance for 3 seconds.
Stance – Persistent Aura: Sona plays the Aria of Perseverance, granting nearby allied champions bonus armor and magic resistance.
Power Chord - Diminuendo: If this spell was last cast when Power Chord is ready, Power Chord will also reduce the target's damage output by 20% for 4 seconds.
Aura Armor & Magic Resist: 3 / 6 / 9 / 12 / 15
Aura Radius: 1000
Song of Celerity
Range: 1000
Cooldown: 7
Cost: 65 mana
Activation: Sona grants nearby allies increased movement speed for 1.5 seconds.
3150 or 
790
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