Don't really wanna write a guide but this build is probably the best I've tried so far and nobody on Mobafire has written it yet. Vi's excessive force is good early game for harassing the enemy and farming, so try to avoid purchasing an item until you can afford giants belt. this should be done fairly early and it will give you a quick advantage over the enemy. Vi's denting blows is an amazing skill in that it affects the enemy by their maximum health, and is based solely on attack speed. With a high enough attack speed, vi can deal 11-13% bonus damage every second and a half or less. believe me when i say this stacks quickly.