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 is a real tank build. I might write a full guide later, depends how much succes it has like this.
At level 18 you should have 5500+ health, I suggest you play carefull so you can stack up.
The healthregen will be insane, you could also once you have enough money drop Spirit Visage and get another Warmog's Armor.