Sona uses the stance mechanic. Her basic abilities all have a persistent aura effect which remains for as long as she doesn't activate another ability. Additionally, her auras remain for 1 additional second after changing stances. Each ability also has an activation effect upon being cast. Sona's basic abilities also set off a 0.5 second cooldown to the other two basic abilities.
After casting 3 spells, Sona's next attack deals extra 8 + (10 × level) magic damage. This enhanced attack has an additional effect depending on which spell was cast last.
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Hymn of Valor
COST: 45 / 50 / 55 / 60 / 65 mana
Stance – Persistent Aura: Sona plays the Hymn of Valor, granting nearby allied champions bonus attack damage and ability power until she changes stances.
Stance – Persistent Aura: Sona plays the Aria of Perseverance, granting nearby allied champions bonus armor and magic resistance until she changes stances.
Armor & Magic Resist: 3 / 6 / 9 / 12 / 15
Aura Diameter: 2000
Activation: Sona sends out healing melodies, healing herself and the most-wounded nearby ally champion. Additionally, both Sona and the healed champion will receive additional armor and magic resist for 3 seconds.
Power Chord - Diminuendo: If this spell was last cast when Sona's Power Chord is ready, her next attack will debuff the target to deal 20% less damage for 4 seconds.