Don't follow the item build to the full extent however the core items are usually manamune and sheen. Since the large mana pool complements your passive and makes you tanky. You want to max out your skill "E" because you have armor pen runes and you skill scales with damage. Then max your skill "W" because it helps get in those extra autoattacks and for the chasing. Lastly get your ult at 6,11,16 and max your "Q" whenever you can't do for the rest. Get a feel for your pull as you need to lead targets when they are moving. I might update this guide so it seems more professional as this is my first guide and my friend asked me to make it.