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Orianna - Power Level 9000!
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Generally, by the end of the game you should have about 920 ability power with a full stack of meijei's and while maybe not a carry, definitely a game changer.
The first thing I noticed was that most of the guides want to take advantage of her attack, which i find mostly useless. I rather just play around with her ball and whack the hell out of things. However, Orianna drains mana like no other as it is easy to lose track of how much mana you spend while throwing around her ball.
That being said, Orianna is amazing early, mid, and especially late game. I will attempt to go into how to play AP style.
The major worry I have early and mid game is mana regen. Orianna's attack command is amazing early on as it will worry enemies and it does a ton of damage early game. She is probably one of the best harassers in the game. Simply put, you can throw around your ball and hit people a few times to grind down their health. Leveling up her attack command first will make sure you save mana while still doing great damage.
Once you hit 6, you can essentially insta kill your opponent in q-w-r. You will notice that people will learn to stay wary of your ball as it can come from any direction when played right.
I want to note that Orianna's final item is interchangeable. That item will be up to you to decide. If you feel that you need some health, defense, or magic resist go ahead. However, keep in mind that with over 900 AP your shield basically adds 1000hp to yourself when you need it. That combined with ability cool down ensures you can constantly keep yourself defended.