Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This build is based on the many I've found but, with slight changes for the better.
Summarizing in this guide and tried to have the most balanced possible urgot, taking between glyphs, talents and Noxian corrosive chargue our armor penetration high enough, can cause serious damage to the enemy. In terms of strategy, it is best to stay away and if we can use the charge noxia corrosive charge and a pair acid of hunters.
With talents we have 9% more of cooldown reduction 18 + 9 = 27 And 6 more of armor penetration, 40 + 6 + 30 (of noxian corrosive chargue)= 76 of armor penetration
Sorry for my bad english.