[CHAMPION CONCEPT] Yuurei, the Ghost Princess

This is a bit of a work-in-progress, so hopefully I'll be updating it as I go.

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Yuurei, the Ghost Princess
http://danbooru.donmai.us/posts/1240550
(picture is meant as a reference)

Statistics (highly theoretical; suggestions are appreciated)

HP: 400 (+80)
HPR/5: 6 (+0.55)
MP: 240 (+60)
MPR/5: 6.8 (+0.65)
Damage: 50 (+3.5)
Range: 500
Armor: 15 (+3.5)
Magic Resistance: 30 (+0)
Attack Speed: 0.625 (+1.53%)
Movement Speed: 335

Abilities (Balance suggestions are greatly appreciated)

Last Update: Feb. 19, 2014

P - Ghostly Dream

Every time Yuurei casts a spell, she sends out a bolt to the nearest enemy (prioritizing Champions) within 750 range, dealing 10*level (+0.2 AP) magic damage to the first enemy it hits (this can be intercepted). Additionally, Yuurei passively ignores unit collisions.

Q - Resurrection Butterfly

Yuurei deploys a spiritual butterfly that hovers in place and tracks a target enemy. If the target does not move out of range (600 range) within 1.5 seconds, the butterfly will fly at the target and explode on impact (175 radius), dealing 80/120/160/200/240 (+0.65 AP) magic damage in an area and slowing all enemies struck by 15/20/25/30/35% for 2 seconds. The primary target is instead slowed by 30/40/50/60/70% for the same duration. If the target moves out of range before the butterfly locks on, the butterfly dissolves and the effect fails.
13/12/11/10/9 second cooldown. Costs 60/75/90/105/120 mana. 500 casting range.
(Resurrection Butterfly also deals 1 true damage to the target upon casting; this is to draw turret aggro.)

W - Phantasmal Illusion

On-ally cast
Target ally is turned invisible (stealthed) for 1/1.25/1.5/1.75/2 seconds, and receives 30 (+0.1AP)% bonus movement speed for 2 seconds (at all ranks). The invisibility (but not the haste) breaks if the target attacks or uses an ability.
(An indicator will appear over your enemy's heads if you are cloaked and within 2000 range of them; this can be seen by all players, and will alert enemy Champions to your presence.)

On-enemy cast
Target enemy Champion has their sight range greatly reduced for 1.5/1.75/2/2.25/2.5 seconds.
(Follows same rules as Graves' Smokescreen; if you're attacked, you'll see your attacker.)

13 second cooldown at all ranks. Costs 70/75/80/85/90 mana. 725 casting range.

E - Doom Sign

Yuurei places a curse on target enemy Champion for 5 seconds, dealing 30/40/50/60/70 (+0.2 AP) initial magic damage upon casting. Basic attacks and single-target spells (not including DoTs) from Champions that strike a cursed target apply a Doom stack. At 5 Doom stacks, the curse is consumed, dealing 60/90/120/150/180 (+0.4 AP) additional magic damage and inflicting fear on the target for 1/1.25/1.5/1.75/2 seconds, causing it to run away from Yuurei.
17/16/15/14/13 second cooldown. Costs 70 mana at all ranks. 725 casting range.

R - Law of Mortality

Yuurei releases dark spirits after a short wind-up, dealing 150/250/350 (+0.8 AP) magic damage to all enemies in a large area (550 radius) and slowing them by 30% for 2 seconds. This also curses the target area for 8 seconds. Enemy Champions in the AOE are afflicted with Fatal Bonds; when one takes Champion-based damage, all other Champions with Fatal Bonds also take 20% (10% for AOE and multi-target damage) of that damage (post-mitigation) as magic damage. Fatal Bonds has a total damage cap of 600/1000/1400 (+1.0 AP). Damage from Fatal Bonds cannot be lethal, instead reducing your health to 1 if it would otherwise be fatal. Damage from Fatal Bonds does not stack upon itself.
140/120/100 second cooldown. Costs 125 mana.

Background (may get some tweaks)

Death isn't so bad, but taking a life is such a terrible thing... - Yuurei

Not all phantoms of the Shadow Isles are malefic spirits. The pure-hearted banshee known as Yuurei was once the sole daughter of the very king who doomed the Shadow Isles to its current state. Regretful of the devastation and ruin brought about by her family, Yuurei is determined to return the Shadow Isles to their former state, and bring her mad father, the Ruined King, to justice.

Centuries ago, Yuurei was the daughter of the king of the Shadow Isles. Her father, known to history as the Ruined King, sought to increase his power and ordered his sorcerers to crack open the barriers between life and death. In the process of their rituals, the sorcerers informed the king that for their greatest ritual, they would need to sacrifice a member of the royal family. Yuurei, believing her father would use this power to protect the kingdom from foreign invaders, offered her life as the sacrifice. She lay herself upon the sorcerers' altar, and her life came to an end.

Yuurei emerged as a spirit, and it was then that she saw the poisoned fruition her father's machinations. In horror, she watched as the land withered, her people faded, and death reigned where there was once life. She realized then what her father had sought all along, and the part she had played in his rise to power. Appearing before her father, Yuurei begged for him to stop before he destroyed everything they held dear. Her father, furious at her defiance, ordered his sorcerers to destroy Yuurei. The princess fled the castle, knowing her father was forever lost to his madness.

Ages passed as Yuurei wandered the decaying wastes that were once her homeland. From the shadows, she watched the Champions of the Shadow Isles rise to power, and learned of their intention to spread the Isles' corruption to Valoran. Yuurei knew they had to be stopped, but knew she could not do it alone. Accompanying the forest spirit Maokai, Yuurei left what was once her homeland, and set off to Valoran, seeking a means to stop the Ruined King and restore life to the Shadow Isles.

Trivia

• When Yuurei captures an altar in the Twisted Treeline, the ghosts will tell her that her father still wants her soul, and that she should flee.
• When Yuurei shops at the Howling Abyss, Greyor (the ghost) will flirt with her occasionally. XD

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Give me a shout on your thoughts for the Champion design.