the build that i always personaly follow, the point is to max stone so that you can be a major early game teamfight hero. it will also help you gank and get kills. then you will max soul rip to get the most out of the stone and zombies, remeber to heal your team mates with soul rip before trying to kill steal. getting ulti when ever possible and maxing decay last but before stats. you should buy a soul ring as soon as you can so you will not be restricted by mana.