Hi there. My name is NukeWhale, and this is my Vi build guide. I made this build after watching numerous pro players using her, Vi, the Piltover Enforcer, and noticing that not only did mine/their build work very well, but the guides on here didn't best represent what I found to work in ranked matches.

Pros:

Fantastic ganks
Near-guaranteed kills lvl 6
Does hurdless damage.
Her Vault Breaker has fantastic utility in early-mid game.

Cons

Not the best in tfs in late game
Her Vault Breaker can be easily dodged

Due to changes by patches, I think Armor Penetration Marks are much more effective than the flat AD ones, so I've changed it to 6 Armor Pen Marks and 3 Attack Speed Marks.

I set these masteries because i think vi has to do very enormous damage in early and mid game, so 21/9 is the best now.

I prefer to put points in his E instead of W because i like to play her on skills-damage and not in autoattacks, normally people always run away, so burst>autoattack

You can flash while using her Q

Clicking on Thresh's Dark Passage while charging your Vault Breaker will put Vault Breaker on cool down.

Vault Breaker will hit targets just beyond the 'max distance' it shows you.

Try to active her E before using Q or R so you will automatically use it.

Vi cannot be stopped by Amumu's Curse of the Sad Mummy.

The Sheen proc makes Excessive Force hit harder, allowing items like Trinity Force to make you hit pretty effing hard.

Assault and Battery does damage to people it knocks aside, so when going for multiple low health enemies who are fleeing, ulting the enemy furthest can sometimes result in easy double kills.