Reworked Leviathan Item?
So, as I understand it, the old Leviathan was removed because it was A: unpopular and rarely used, and B: too snowbally because of its interaction with Atma's.
The unpopularity was due to it being a niche item as well as having to be weak because of its synergy with atmas to snowball out of control. Now that Atma's is gone, I believe it is time to bring back Leviathan. AP supports frequently buy Mejai's because of its stacks for assists, and I think Leviathan could be tailored much more specifically towards utility tanks/tanky supports, with a simple change like this: The stacks it gives increase your bonus HP by a percent per stack (say 1.5%) with a flat amount of health (300) and a max of 20 stacks. At max stacks it would give 300+30% bonus health.