Champion Concept Lyanna-The Guardian Angel

I had this idea lingering in my mind for a while and now I just need to share it here. The numbers aren't in any way final and will meed some balancing.

Lyanna - The Guardian Angel

Abilities: Passive AA dont target enemies, but target allies and heal them for 1%(+1% per 200AP) of their max health per hit and providing them 14 (+2 per lvl) MS for 0.5 seconds

Q (10/9/8/8/8 sec cd) Cleanses a small target area with heavenly fire, dealing 50/75/100/150/200 (+0.4AP) magic damage and reducing enemies armor and mr by 1/2/3/4/5% (+1% per 100AP) for 3 seconds

W (25 second cooldown) Generates a blessed fog around herself that lingers in the air for 3/5/8/10/15 seconds (500 units radius). It blocks enemies vision and slows them by 10/20/30/40/50%

E
Lyanna draws back into the spirit world, making herself untargetable, invulnerable and getting 50/100/150/200/250 MS while ignoring unit collision over the duration of 5/6/7/8/10 seconds. Also provides sourrounding allies with passives MS boost

R (Ult) (100/80/60 sec cd) Summones a heavenly Storm over herself (300/400/500 units radius) that blows enemies out of the area, dealing 200/300/400 (+0.6AP) damage and blocks incoming enemy projectiles. Under the storm cloud, passives healing is doubled

Lore: Lyanna was a spirit of the former Blessed Isles. However, when the Black Mist was created by the Ruined King, it could not get a hold on Lyanna for she was uncommonly pure. When Lyanna fled in grief from her destroyed home, her only goal was to prevent others from suffering such a pain. To achieve this she uses the healing and protecting powers of the former Blessed Isles that are still powerful in her, despite her home being destroyed.