The RoA, Frozen Heart, Banshee's build was OP in season 2 when resistances were strong and so many top-laners would buy WotA to help you be un-killable. It's still decent now, but it gets out-shined by spell pen.
Get RoA -> Seraph's -> Sorc Shoes -> Haunting Guise -> Abyssal then you do true damage (or even amplified damage) to anyone who gets hit by your E. His E has been so OP since they re-worked him a few months ago, and the new Seraph's item is great on him for the shield and all the damage.