Hi this is my build and guide for vayne.Take comment and like my build.

The world is not always as civilized as people might think. There are still those who would follow the blackest paths of magic and become corrupted by the darker powers that flow through Runeterra. Shauna Vayne knows this fact well. As a young privileged girl in the heart of Demacia's elite, her father tried to convince her of the constabulary's ever-vigilant eye. Young and nave, she truly believed that her world was one of perfect safety, until one night, when a twisted witch took interest in her father. The malevolent woman overcame her father's conciliar guard, then tortured her family before murdering them. The young Shauna escaped only by hiding herself and then fleeing once the hag had departed, plagued by the screams of her loved ones as she ran. A burning hatred was born in her that day, one that could never be denied. Vayne was able to take care of herself using her father's money, and she began to train as soon as an instructor would have her as a student. By the time she was a fully grown woman, she had become a grim warrior. However, the fields of battle were not to be her home. Demacia needed a protector, one who hunted those lost to the darkness. Shauna used her family's contacts to become the first Night Hunter, and now her prowess is the stuff of legends. It is said that those who practice the black arts quake when they hear that the Night Hunter is on the prowl. Despite her crusade, Shauna has looked at the League of Legends in horror. There are champions who have clearly lost themselves to the blackest of magics, and who have been embraced within the League even though they should be put down for the safety of all. The time has come for the Night Hunter to execute her secret mission to purge the League of Legends. Not all shadows are to be feared. At least, if Vayne has her way.

Night Hunter (passive)
Vayne ruthlessly hunts evil-doers. She gains 40 Movement Speed when moving toward nearby enemy champions.
Tumble
Vayne tumbles, maneuvering to carefully place her next shot. Her next attack deals bonus damage.
Silver Bolts
Vayne tips her bolts with a rare metal, toxic to evil things. The third consecutive attack or ability against the same target deals a percentage of the target's maximum Health as bonus true damage. (Max: 200 damage vs. Monsters)
Condemn
Vayne draws a heavy crossbow from her back, and fires a huge bolt at her target, dealing damage and knocking them back. If they collide with terrain, they are impaled, dealing bonus damage and stunning them.
Final Hour Readying herself for an epic confrontation, Vayne gains increased Attack Damage, stealth during Tumble, and quadruple the bonus Movement Speed from Night Hunter.

Pros:
Great damage output
Passive deals a lot of true damage
Not very mana-hungry
Not a fully auto-attack champion (that's a big '+' for me)
No one can run away from her ultimate
Has some sort of natural escape mechanics (condemn, ultimate+tumble for stealth)
Looks very cool
Fun to play


Cons:
Squishy
Vulnerable to CC
Condemn can stun, but is not reliable
It's hard to position yourself well in team-fights
Often targeted first
People will say you play an OP champion

At the moment, i chose 21-0-9 for the masteries. I do not take Archaic Knowledge since none of your abilities deal spell damage.
I also don't take Lethality because i do not really rely on critical strikes, and put some points into Offensive Mastery instead for easier minion killing. However, you can put the points in Lethality if you want, since we are getting Infinity Edge anyway.
I also take Alacrity because more attack speed gives me more damage from Silver Bolts.

As for the utility tree, i take Awareness for faster leveling, and put the last point in greed to get some free gold.

I always takeVampiric Scepter because with this item i can stay longer in lane and still harass enemy. My first recallBoots of Speed andDoran's Blade.
Why i take dorans balade because i need some hp dmg and more life steal.
Second recall i takeB. F. Sword or if i have enough money i grabthe bloodthirster after i buy bloodthirster i alway takesheen because its procs with trumble.
After sheen i usualy takeBlack Cleaver.Then i finishTrinity Force after Trinity Force u should takePhantom dancer orMadred's Bloodrazor if they have some heavy hp champions and my last item isInfinity Edge