Introduction
This is my first build.

When I read the news at the LoL site I thought she would be really not usefull for someone like me, but when she came out I bought here, after 13 matches ( 10x 3v3 and 3x 5v5 ) I made this build, Enjoy! She's and Range, AP and a good farmer. All here abilities are used by here ball so actually u need to control 2 things, Orianna and here ball.

Orianna's Story :

There once was a Piltovian man named Corin Reveck who had a daughter named Orianna, whom he loved more than anything else in the world. Though Orianna had incredible talent for dancing, she was deeply fascinated by the champions of the League of Legends. This fascination compelled her to begin training to become such a champion. It is unfortunate that her sheltered, wide-eyed naivete led her to take unnecessary and dangerous chances which ultimately led to her tragic demise. Orianna’s death shattered Corin, driving him into deep depression and an obsession with techmaturgy. He could not stand the void his daughter’s death left in his life, so he decided to build a replacement – one that would complete Orianna’s dream of joining the League. What was created is the clockwork killing machine that Corin named after his daughter. Knowing that she was destined to be a champion and seeing the way the times were changing, he created The Ball as her pet and protector. This nearly symbiotic creation uses a different type of techmaturgy, relying more heavily on electricity than clockwork.

Orianna and The Ball now fight as Champions in the League of Legends, using the Clockwork Girl’s sometimes misguided morality as a compass. She tries in earnest to fit in with those around her. However, no matter how hard she tries, Orianna can never be human and there is always something unnerving and alien about her. Though she attempts social interaction with other champions in the League of Legends, there are few who can get past her exotic nature. To many, it’s as if there’s nothing inside, that Orianna is just a soulless clockwork shell – a dangerous and deadly one at that. However, all along she remains the perfect daughter in her father’s eyes.

“Dance with me, my pet. Dance with me into oblivion.”

Items

You can buy this stuff in the order that you want. But I think this are the best items for Orianna.

First I buy a Doran's Ring, it's the best item in the begining, u can always sell ur doran's ring. After that buy boots of speed and Tear of the goddess. After that buy Ionian boots of Lucidity and Archangel's Staff . Then there are 4 other stuff, these stuff you can buy in the order u want.
-Rylai's Crystal Scepter
-Lich Bane
-Rabadon's Deathcap
-Nashor's Tooth

Tips

All of Orianna's abilities work with here ball except auto attacking.
U must always know where your ball is.

Command:Attack : This is your first abilitie, whit this u travel your ball to a location, the creeps or champs that it passes deal damage and when it arives at his location its a small nuke.
REMEMBER: When u command your ball to a location, and you dont call it back, it stays there when you do this abilitie again it wil travel from the place where the ball is so it will not pass from you-place but from ball-place.


Command: Dissonance
This makes a nuke at the place where the ball is, this also slow enemies that walk in, allies that walk in gain movement speed.
REMEMBER: When u are escaping and the ball is controlled by Orianna, then use this abilitie and the enemies that are following you will be slowed.


Command: Protect
This abilitie lets your ball come back to an allied champion, the champion that then controls the ball gains an shield.
REMEMBER: When an allied champion is escaping u can trow your ball to that champion, then use your second abilitie so they're slowed.


Command: Shockwave
Orianna commands her ball to unleash a shockwave, dealing magic damage and launching nearby enemies towards the ball after a short delay.

Here passive :

Clockwork Windup:
Orianna uses her ball as a focus for her spells and attacks. Orianna's ball automatically returns to her if she is too far away from it.

Orianna's autoattacks deal additional damage plus 20% of her Ability Power in magic damage. Subsequent attacks against the same target within 4 seconds deal an additional 15% magic damage. This bonus stacks up to 3 times.

Spells
Ghost : I use this to quickly travel across map, escape and follow escaping champs.
Clarity : Always helpfull, when no mana u can still use this
REMEMBER: When u use this and there is a friendly champ close to you he also gains mana.

U can also use :

Killing jungle monsters and minions is easy with Orianna.

Use this combo :>>>>>>>>>.

Pros:
- Hard to play but after a while really funny.
- Good teamplayer
- Really helpfull shield
- Good in 2v1 lane

Cons:
- Fast dead
- Can't kill an enemy champion fast.
- U need good protecting team mates or u die to fast