Hey guys . Welcome to my Akali Guide. This is my second guide . Look my other guides , too . Uhm , i´m happy about comments and upvotes :D Send Gamehistorys and i put them into my guide .
So try it and reply. Sorry for my bad english ..

There exists an ancient order originating in the Ionian Isles dedicated to the preservation of balance. Order, chaos, light, darkness -- all things must exist in perfect harmony for such is the way of the universe. This order is known as the Kinkou and it employs a triumvirate of shadow warriors to uphold its causes in the world. Akali is one of these shadow warriors, entrusted with the sacred duty of Pruning the Tree - eliminating those who threaten the equilibrium of Valoran.

A prodigal martial artist, Akali began training with her mother as soon as she could make a fist. Her mother's discipline was relentless and unforgiving, but predicated on the fundamental principle: ''We do that which must be done.'' When the Kinkou inducted her into the order at the age of fourteen, she could slice a dangling chain with a chop of her hand. There was no question - she would succeed her mother as the Fist of Shadow. She has had to do much in this role which others might find morally questionable, but to her it is in service of her mother's inviolable doctrine. She now works with her fellows Shen and Kennen to enforce the balance of Valoran. This hallowed pursuit has unsurprisingly led the triumvirate to the Fields of Justice.

''The Fist of Shadow strikes from the cover of death itself. Do not impede the balance.''

Damage 53 (+3.2 / per level)
Health 425 (+85 / per level)
Mana 200 (+0 / per level)
Move Speed 325
Armor 13.5 (+3.5 / per level)
Spell Block 30 (+1.25 / per level)
Health Regen 1.45 (+0.13 / per level)
Mana Regen 10 (+0 / per level)

Mark of the Assassin - Akali spins her kama at a target enemy to deal magic damage and mark the target for 6 seconds. Akali's melee attacks against a marked target will trigger and consume the mark to cause additional damage and restore Energy.
Akali throws her kama at a target enemy to deal 45/70/95/120/145 (+0.4) magic damage and mark the target for 6 seconds.

Akali's melee attacks against a marked target will consume the mark to cause 45/70/95/120/145 (+0.4) magic damage and restore 15/20/25/30/35 Energy.

Cost
60 Energy
Range
600

Twilight Shroud - Akali throws down a cover of smoke. While inside the area, Akali gains Armor and Magic Resist and becomes stealthed. Attacking or using abilities will briefly reveal her. Enemies inside the smoke have their Movement Speed reduced.
Akali throws down a cover of smoke that lasts for 8 seconds. While inside the area, Akali gains 10/20/30/40/50 Armor and Magic Resist and becomes stealthed. Attacking or using abilities will briefly reveal her.

Enemies inside the smoke are slowed by 14/18/22/26/30%.

Cost
80/75/70/65/60 Energy
Range
700

Crescent Slash - Akali flourishes her kamas, dealing damage based on her Attack Damage and Ability Power.
Akali flourishes her kamas, slicing nearby enemy units for 30/55/80/105/130 (+0.6) (+0.3) physical damage.

Cost
60 Energy
Range
325

Shadow Dance - Akali moves through shadows to quickly strike her target, dealing damage and consuming an Essence of Shadow charge. Akali recharges Essence of Shadow charges both periodically and upon kills and assists, max 3 stacks.
Akali moves through shadows to quickly strike her target, dealing 100/175/250 (+0.5) magic damage.

Akali stores an Essence of Shadow on kills and assists as well as every 25/20/15 seconds up to 3 total.

Cost
1 Essence of Shadow
Range
800

Passive --> Twin Disciplines - Upon obtaining 20 Ability Power, Akali's basic attacks deal 8% bonus magic damage, increasing by 1% for every 6 Ability Power gained thereafter.

Upon obtaining 10 Bonus Attack Damage, Akali gains 8% Spell Vamp, increasing by an additional 1% for every 6 Bonus Attack Damage gained thereafter.

- You can use runes and masteries to trigger her passive.
- Akali excels at killing weaker characters. Let your team initiate and then strike at the people in the back.
- Find the balance between storing Essence of Shadows, and using Shadow Dance before having max charges.

Marks: I take MagicPenetration Marks as a replacement for Sorcerer Shoes.
Seals: I take FlatArmor Seals for more stamina
Glyphs: I take FlatMRes Glyphs for more stamina
Quintessences: I Take FlatAbillityPower for more Damage with my skills . You can also take Attackdamage Essences (Passive) .

I take 21/0/9 Masteries
-I upgrade my Ignite Summoner Spell . Ability Power , Cooldown Reduction and MagicPenetration , but also 5% more Ability Power
-I upgrade my Flash Summoner Spell , more Movement Speed and reducing time spent by death .

Other Viable Items

Sorcerer's Shoes : - More MagicPenetration means more Damage with your skills .

What to replace : - Mercury's Treads

Boots of Swiftness : - It is one of my favourite Boots for Akali . 415 Movement Speed + Lich Bane . So it is not easy to get you in combination with your Shadow Dance or your Twilight Shroud .

What to replace : - Mecury's Treads

Trinity Force : - Good Damage , Good AP , Movement Speed , and Passives . Good Choice .
What to replace : - Guinsoos Rageblade

Frozen Mallet : - Maybe , you aks why Frozen Mallet . I explain : Healt , Damage for your passive and by every hit it slows .

What to replace : - Rylai's Crystal Scepter .