ZZ'rot too powerful
First I want to ask why it's a tanky item instead of a strictly AP item. With a lot of tanks already being impossible to kill in a timely manner, they're basically adding another 1600 HP onto the fight by forcing you to focus the portal so it doesn't devastate the towers. I get that they want tanks to be able to push, but that shouldn't be acceptable. If you want a hard split pusher, you choose one. There shouldn't simply be an item that makes unkillables like Garen, Shen, or Nasus able to desecrate towers. (all of which already have a proc ability to damage them.)