Hello everybody, I'm Krwawy and this is my Guide - Orianna - nightmare of mid. This is my first guide, so pleas tell me what i do good and bad.

Orianna is very interesting and powerful champion, reason? Just tell me
So I wish u enjoy reading and please comment and vote my guide.

Pros
+Burst
+Speed
+Slow enemy's
+Shield
+Useful ultimate

Cons
-Mana hungry
-Week at start
-Requires Farm

Offense tree
In offense tree is just normal max ap build, why i don't take Sunder ? We just need ap, and we have enough armor penetration we have from Runes and Items.

Defense tree
That tree can't give us some ap.

Utility tree
Orianna is mana hungry, so we need mana regeneration, so most
important in this tree is Meditation

We take:
9 Greater Mark of Magic Penetration - I take magic penetration marks, because that give us perfect penetration witch our items, and that give us easy way to burst tankers.
9 Greater Seal of Ability Power - we have magic penetration, so we just need more ap.
9 Greater Glyph of Ability Power - ap we need more ap!
3 Greater Quintessence of Ability Power - Our Seal+Glyph+Quint=nice damage on first lvls.

Flash-Easy escape from hard situation
Ignite-More damage - less luckers ;)

Q-Short cold down, nice damage and its AoE ability, what u need more?

W- Very useful ability second AoE what give as nice farming plus its speed for our team an
slow for enemy.

E- This spell is nice to run away when u are under ignite and when u have hard lean, but its don't
give us any burst.

R- very useful ultimate. That can grab enemy's under our turret, that AoE stun and
so big damage, its can change team fight on your site very easy.

- We We want this item for the Magic Penetration.
- nice hp and mp regen on early lvls and nice damage too.(but remember too buy [Catalyst the Protector first)
- help for u and your team. Its good too stay on line longer.
- the most important item for ap carry.
void stuff - More Magic Penetration to nuke.
- Good item too survive in team fight

What you should do with Orianna in team fight?
At 18 lvl Orianna is very useful in fight, she can make amazing burst, give big shield to most focused teammate, and slow all enemy's who are trying to run away, at last she can turn team fight on your site with her AoE stun ([ommand shockwave]).