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.
A build to KILL the enemy, with this build you will have a great DAMAGE from early game, because you don't buy ANYTHING but boots until you can buy BF Sword that gives you +50 Damage, I take this from another build. Then I add items for Attack Speed, Critical chance, and one to Survival.
So, the most Important Thing on this is to Buy BF Sword at early game.