According to the game developers, the modifications made for Sona in the past years allowed the hero to stray away from the bottom lane, which isn’t exactly what they wanted while making the changes. Therefore, last year conversions, such as adding mana refund, were made to bring Sona back to the support role.
Now Riot is revisiting the champion once again and is planning to give him a new mechanic, which is supposed to replace the mana refund aspect. In the near future, when Sona will damage an enemy with her Q - Hymn of Valor or heals an ally with W - Aria of Perseverance, she will gain a stack of Accelerando.
Accelerando will grant her ability haste for her basic skills. Hitting someone with Q will grant two stacks, and W will be able to give her up to 5 stacks if it heals or blocks damage on all four friendly champions.
Besides giving her ability haste, when Sona reaches the cap for Accelerando, she will be refunded a bit of her ultimate ability, Crescendo, cooldown. The goal of those changes is to inspire a more aggressive playstyle on the champion. Sona rework is planned to hit the official LoL servers in patch 11.16, which is scheduled to arrive on 18th August.
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