Remember when Sion was THE infinitely stacking hp character?
Honestly, at this point Cho'gath really overtook sion as the big ultra-lategame Titanic Hydra wielding meatwall. Just compare the two.
Sion: 543 – 1784 Base Hp Cho'gath: 574 – 1934 Base Hp "Tanky" Champion average: 2000-2400ish Base hp
Sion "Pays" more for the potential power of his hp farming than Cho'gath, with a much lower base hp.
Cho'gath gains 80-160 hp each feast, while Sion gains 2 hp per minion and 10 hp per large monster or Champion takedown. Even if Sion survives all the way through an aced fight, he'll only gain 50 hp to Cho'gaths minimum of 80 for landing his ult once.
Granted, it's part of his ultimate, but one of the few parts of Sion to be kept from his old incarnation was his ability to stack his health up via farming. It's one of the core elements of Sion to be kept, and I really feel like he's being overshadowed by someone else at his own game here.
Is there any plans to increase Sion's overall health pool or make his hp farming capabilities more effective?
Try summoning