Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Hymn of Valor - Persistent Aura: Sona plays the Hymn of Valor, increasing nearby allied champions Damage and Ability Power by 8/11/14/17/20.
Activation: Sona fires bolts of sound, dealing 70/120/170/220/270 (+0.6) magic damage to the nearest two enemies (prioritizes champions).
Aria of Perseverance - Persistent Aura: Sona plays the Aria of Perseverance, increasing nearby allied champions Armor and Magic Resist by 8/11/14/17/20.
Activation: Sona sends out healing melodies, healing Sona and the most wounded nearby allied champion by 40/65/90/115/140 (+0.5).
Song of Celerity - Persistent Aura: Sona plays the Song of Celerity, granting nearby allied champions 8/11/14/17/20 bonus Movement Speed.
Activation: Sona energizes nearby allies, granting them 8/11/13/17/20% Movement Speed for 1.5 seconds.
Crescendo - Sona plays her ultimate chord, forcing enemy champions in a line in front of her to dance, taking 150/250/350 (+0.7) magic damage over 1.5 seconds.
Power Chord - After casting 3 spells, Sona's next attack deals 24 + 12 x lvl bonus magic damage.
Additionally, Sona's Auras persist for 3 seconds after deactivating and set off a 2 second global cooldown.
Faerie Charm or Regrowth Pendant
Tear of the Goddess Mana reg/Builds mana.
Mejas Soulstealer Sona rarely dies and stacks assists and kills.
Spirit Visage 30 Magic resist/20% Self-healing/CDR
Frozen Heart 99 Armor/CDR/Reduced enemy AS/Mana
Zhonya's Ring 120 AP/+25% AP
Tear of the Goddess into Archangels Staff.
Philosophers Stone into a Shurelyas Reverie last.
This build helps keep Sona alive to stack AP from kills and assists. I know this build lacks AP compared to other builds, but I rarely have trouble late game with a good team. Also, a low AP Sona is better than a dead Sona since players tend to target her. This build lets you go into team fights to heal/dps/stun and lower the enemies AS with a lower risk of dying.
Please leave constructive criticism. =]