Welcome to my Sivir Build. It's kinda trash, but i'm glad if someone likes it. I try to make this one better than my first build. ENJOY! =)

Sivir, The Battle Mistress

Backstory:

The beautiful and deadly champion known as Sivir has been a favorite of League summoners for close to a decade. A soldier-for-hire outside of the Fields of Justice, she is the embodiment of a highly successful mercenary on modern day Runeterra. Sivir has little interest in the ''cribbage sheets'' - as she calls them - of League influence bartering. Instead, she is motivated by material wealth and riches, and she is paid handsomely for her services. Sivir is one of the wealthiest individuals found anywhere on Valoran. Sivir owns multiple residences in a number of different city-states, as well as ownership stakes in a number of businesses all across Valoran. Her detractors, either envious of her success or acrimonious of her flexible morality, have begun to use Sivir as a symbol of what is wrong with the mercenary nature of the League. Sivir dismisses her critics, saying that while her personal code of ethics is less ruthless than her competitors, ''Everyone has a price.''

Sivir has earned many titles and accolades throughout her illustrious career, but the one she held until recently was ''Battle Mistress of Noxus''. Now she is simply known as ''The Battle Mistress'' after breaking her contract with the Noxian High Command. Sivir dared to object to the Noxian war against the peaceful island state of Ionia, though less about the morality of the issue than the planning behind it; her predictions of a bloody stalemate came true when the Ionians held off the relentless assaults of the Noxians. Claiming that the Noxian High Command had lost its direction, she left Noxus and made her services available to the Institute of War. The Noxian High Command has sent a number of contracted assassins to deal with its rogue mercenary, but none have delivered her or survived.

''Time and time again, Sivir proves that she has earned the right to call herself 'The Battle Mistress'.'' -- Jax

Base Stats:

Damage: 52.11 (+2.9 / per level)
Attack Speed: 0.679 (+3.1%/ per level
Range: 425
Health: 378 (+82 / per level)
Mana: 203 (+43 / per level)
Move Speed: 310
Armor: 12.75 (+3.3 / per level)
Magic Resist: 30 (+0 / per level)
Health Regen: 4.25 (+0.55 / per level)
Mana Regen: 4 (+0.3 / per level)

Skills:

Fleet Of Foot (Passive):

Increases Sivir's dodge chance by 10/15/20/25% while moving.

Boomerang Blade (Ability Q):

Sivir hurls her crossblade like a boomerang, which deals 80/125/170/215/260 ( + 0.75) magic damage to the first unit and 20% reduced damage to each subsequent target.

Cost: 80/90/100/110/120 Mana
Range: 10000

Ricochet (Ability W):

Toggle: Sivir's basic attacks will bounce to 1/2/3/4/5 additional target(s), dealing 25% less damage with each bounce (only the first hit procs item effects).

Cost: 6 Mana per Attack
Range: 20

Spell Shield (Ability E):

Creates a magical barrier that blocks a single enemy ability used on Sivir. Lasts up to 3 seconds.
If an ability is blocked by the shield, Sivir regains 150 mana.

Cost: 75 Mana
Range: 20

On The Hunt (Ulti Ability R):

Grants Sivir and nearby allies 25% movement speed and 30/60/90% attack speed (1/3 for allies) for 15 seconds.
Cost: 100 Mana
Range: 1200

I made few options for what kind of enemy team you have against so there is Armor Penetration Build, Magic Penetration Build and Hybrid Build. Why so many options? Like i said depending on enemy team like if you have Mordekaiser against you and you are building ArPen Build, it might work, don't let it hang on that it might work. Look what items he has and then think what should you go for? I think usually Mordekaiser build are more for magic resist than armor. TIP: If you're enemy team has lots of CC's buy Mercury Tread's instead Ninja Tabi because it's wise if you don't wanna die to Stun or Taunt.

Situational Items:

You can use these if you have hardtime to get kills and your wallet is empty.





And if you have healers against you you can buy Executioner's Calling.

WARDS! POTS!

Maybe useful items in the game. Buy Wards, Pots, Elixirs how your needs are.

Pros:
+

Good Farmer

+

High Dodge Chance while moving

+

Great Ulti

+

Protect for Enemy Abilities

Cons:
-

Squishy Early Game

-

Mana Hungry Early Game

-

Battle Blade & Spell Shield hard to master

I chose Flash and Ignite because On The Hunt's duration is low so i picked Flash to support that and Ignite finishes all low health champs.

Other possibilities:

Ghost, it boosts nice On The Hunt.
Teleport, you can save tower or if you have low health you have to go heal you can Teleport back.

They all are 21/9/0 but points moving little bit depending on the, what each build needs.