NEW RUNE GIVES YUUMI PERMA +15% DAMAGE?! and it's not even a keystone

Yuumi has a secret OP Rune that isn't even a keystone? Free 15% Damage Increase

Runes: Aery, manaflow, transcendence, scorch
Precision: Presence of Mind, Cut down
Secondaries: 10 ap, 10 ap, armor

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