Hi, this is my first build/guide for any champion. I will not speak of everything that Orianna can do, most guides allready cover that all i want to show you is the items that i think makes you win the game.

If your unsure if this build is good or not have a look on 3 of my latest games i had.

I see the builds on Orianna and i see that not many cares about her passive. Oriannas passives makes her basic attacks stronger with abilty power. At the end of most of my builds i get 100 magic damage and 100 attack damage in basic attacks + all of her abilites still does tonns of damage.
You might get a bit confused by the build but i will try to explain as good as i can how it works.

I'm sorry for any typoes my English is not the best. I do not apply that this build is the best in the world but it's the build that works best for me and i would say it works in most situations.

1st Build.
On the first page, it is about having the most damage as possible for early domination.
This build works best in solo mid or top (don't recommend solo top) This build does not aim for having alot of mana all the time. So if you have problems about mana then you should get clarity or think of using the 2nd Build.

2nd Build.
On the 2nd page, it is more of a normal ap build then anything but still get some attack speed. That page is made for more mana regain and more of a teamplayer then soloing. Orianna can be quite handy with her sheild to stop Karthus, Ashe or Ezreals ultis to kil a champ since it give them + Magic resistence and Armor. If you're laning the sheild (E) is really important cause it can save you and your lane partner!

3rd Build.
In the 3rd build it's just items that i would recommend people to use. Those items can be good for diffrent games.

Core build
The core build is Dorans Ring, Sorcerer's Shoes, Nashor tooths, rylais and Lich bane. the 2 last items that you take depends on the game. If you need Armor, MR, AP, Attack speed. Then you chose from the 3rd Build. What i normally take is the first build.