Set's haymaker is scaling to hp/attack items. Here's my build -steel plated boots (optional) -heartsteel -black cleaver -divine sunderer -steraks gage -sundered sky -spear of shojin -warmogs armor -sunfire aegis More stacks of heartsteel more damage of haymaker. So stack more in early to mid game. Baron buffs can add haymaker damage by 200 points. You can reach 3k-4k haymaker if you can stack 2k heartsteel stacks.