Selene, godess of the moon.

Selene is a Greek godess. She is the daughter to the titans Hyperion and Theia. She is also mentioned in the Roman mythology where she is known as Luna.
Selene is a ranged mage/ support.

Passive: [un-named] After 5 succesfull basic attacks Selene gains 10% movement speed and 5% additional magical power and lifesteal.

Duration: 10sec.

First abbility: Starfall.

Selene brings down a star the comes crashing in from of her. Starfall is a small long-ranged AoE abbility. Enimies hit by the abbility are knocked back and have their magical protections reduced.

Magical protection debuff: 10/20/30/40/55.
Mana cost: 70/95/110/120/135.
Damage: 50/120/195/240/310 + 50% of your magical power.
Cooldown: 16/14/13/11/9 sec.

Second abbility: Moonlight.

Selene shoots out moonlight in a straight line front of her. Moonlight goes through all enimies hit. The abbility is casted instant but flies in the same speed as Ra's 1st abbility. Enimies hit by the abbility are also slowed.

Damage: 90/130/170/230/270 + 60% of your magical power.
Slow: 10/15/20/25/30%.
Cooldown: 18/16/14/12/10 sec.
Mana cost: 60/80/90/105/120.

Third abbility: Pray.

Selene prays to the moon granting her and all alies within a small area additional protections and movement speed.
Pray also gives Selene a stack every time she kills an enemy minion. (Up to a maximun of 30 stacks.)
Each stack gives Selene magical power. (Full stacks gives Selene an additional effect on her ultimate abbility.)

Active:
Physical/Magical protection buff: 10/20/35/55/70
Movement speed buff: 5/10/15/20/25%.
Cooldown: 18/17/15/14/12 sec.
Mana cost: 50/65/80/100/110.

Passive (stacks):
Magical power (per stack): 1,5 magical power.




Ultimate abbility: Gravitational Field. Selene uses the moons gravity to slow and debuff all enimies in a large area around her. (About the size of Artemis 4.) Selene is immune to any crowd control inside of the area. As selene walks she brings the gravitational fiel with her.
If she has maximum stacks on her 3rd abbility this abbility will also make alies immune to crowd control and give them 10% additinal damage. (Magical and physical.)

Magical protection debuff: 10/10/10/10/10%.
Physical protection debuff: 10/10/10/10/10%.
Slow: 10/15/25/35/50%.
Duration: 7/9/11/13/15sec.
Mana cost: 100/130/170/220/255.
Cooldown: 110/105/100/95/90 sec.

If you have any suggestions/improvement leave them in the comments.

In the third ability description, is believe supposed to be pray?