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Vi Build Guide by TheHalfDragon
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In the defense tree I take Tough Skin / Bladed Armor and Durability / Veteran's Scars . I put my last point into Hardiness to take a slight edge off of the damage creeps do.
I take Mark of Attack Speed and Glyph of Attack Speed so I can get my Denting Blows of as many times as possible thus putting out maximum damage. Some people may feel running armor runes on her is better, be my guest, but personally I believe that attack speed is what makes her really efficient in the jungle.
For my seals I take Seal of Scaling Health. This allows her to come out of the jungle far more tanky than expected. I guarantee you that when that Ezreal down bottom sees you coming with 1,000 health by level 4 he is going to think twice before picking on your ADC too much.
Finally for my quints I take Quint of Armor Penetration. This will allow you to shatter even more armor than you are already.
After a little bit of saving you should go back and buy a Recurve Bow which will allow you to apply the most stacks of Denting Blows in the shortest amount of time. Still, you need to be careful... until you back this next time. You now buy a Phage, though it seems like a small purchase, it gives you enough health and damage combined with it's passive that you are a force to be truly reckoned with.
Now that you are slightly tanky, you have been able to tower dive, duel, and secure some kills. What will you do with all that extra gold? Buy a Wit's End and Mercury's Treads. They will allow you to stomp mid lane and take their tower. While you aren't invincible, you sure aren't easy to kill.
With your next bit of gold you should build into your Frozen Mallet. This will make you fathoms more tanky and let you slow 100% of the time instead of the 25% chance. You should be able to secure many more kills for your ADC and mid lane which will earn you assists. Assists mean money, and you know what money means!
Start on building your Tiamat. Until recently, the Tiamat was frowned upon in competitive use. Now with the addition of Ravenous Hydra the Tiamat is no longer considered "trolling". So what should you do? Obviously build Ravenous Hydra!
Next build your Avarice Blade, with your new AoE auto attacks you should be raking in the gold by the truck load. Finish your Atma's Impaler for the extra armor and damage and then buy a Hexdrinker to hold your last slot. Chances are the game didn't make it this far... but if it has you can build that Hexdrinker into the Maw of Malmortius. This will complete your build and turn you into an unstoppable force.
(Note: If the team is AD heavy and you are having trouble sticking in team fights or staying alive, you can always build a Guardian Angel. While I am not the biggest fan of GA on Vi, sometimes it is necessary.)