My idea for a Leona rework

Leona is a cool champion, but right now she isn't really relevant. Her kit has nice theming and has some good parts, but can feel kinda clunky and could use some updates. I am not going to put exact number changes because I am not a balance expert, but instead I will put my general ideas for abilites to make Leona not only a more viable support, but make her a possible solo laner if you are feeling spicy.

Passive: Basic attacks on enemy champions reduce the tenacity of the target by ~20%. Enemies can receive up to negative 20% tenacity. This ability can only be applied once to targets and lasts for around 3 seconds, and has around an 8 second cooldown agter being applied to an enemy

Q: Remains the same

W: A circle of sunlight surrounds Leona, granting her armor and magic resist scaling on her bonus resistances. Allies that touch the circle receive 75% of the defensive buff. After a short delay, the circle erupts, dealing damage to all enemies within it. If at least 1 enemy is hit, the duration of the defensive buff for Leona and her ally is extended by 3 seconds.

E: If no enemy champion is hit, Leona dashes to the last minion hit

R: Remains the same

Comments and criticism welcome.