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 designed for heavy mid to end game lane control and is great for pushing lanes and soloing turrets.
Since you'll be rushing Rageblade, it's important to stay in lane as long as possible. Buy 4 Health Potions and 4 Mana Potions to start. Try to stay in lane until you can buy Pickaxe but if your getting beat up bad go back for the Blasting Wand and grab some more Potions if you need them. Go back to laning until you have enough gold to return for the Rageblade.
Now is a good time to see if your buddies need any help. Check for gankertunities; Your pumped up Reckoning will hit pretty hard. After roasting some enemies, focus on getting your Berzerker Greaves killing minions as much as possible. Now you basically want to rush Bloodthirster. You should have Bloodthirster by lvl 15, and by now you will flatten waves of minions with Righteous Fury. Charge up your Bloodthirster while at the same time taking lane control and farming gold for your Phantom Dancers.
Once I have The Bloodthirster I focus on keeping the outer lanes pushed back and clear of minions, and then swooping into mid to throw fire all over the place and focus on protect allies just as much as killing enemies. Concentrate on holding minions as close to the enemy base as possible, and solo turrets with Intervention if the opportunity arises.
Good luck and have fun!