Damaging enemy champions with basic attacks or abilities sends Aery to them, dealing 10 - 40 based on level (+0.1 AP) (+0.15 bonus AD).
Empower or protecting allies with abilities sends Aery to them, shielding them for 30 - 75 based on level (+0.22 AP) (+0.35 bonus AD).
Aery cannot be sent out again until she returns to you.