Interested in what GAF thinks Sion should build.
His ratios aren't great in general, so clearly tank is the right direction with maybe a BORK or TF later. Sion scales with health, so he wants to build it, but he also has infinite health scaling, so any health you buy gets progressively less efficient. I dunno! I'm torn between Randuins first or Frozen Heart first.
I would probably do Randuins. He has a bit of stickiness to one target, but his AoE control is lacking. Randuins ==> Q smash would be a pretty good amount of AoE control.