What if sion got a minor rework?
Passive: Soul furnace; If an enemy or monster dies near sion he gains one stack of soul furnace and two additional stacks for champions, large monsters, and epic monsters. One stack of soul furnace grants 0.1% increased maximum health.
W: Death surge: Sion bathes in the blood of his enemies, granting him 50 / 75 / 100 / 125 / 150 (+ 8 / 10/ 12 / 14 / 16% maximum health) shield. When the shield is depleted, sion releases a wave of blood that deals 50/60/70/80/90% of the shields maximum value to enemies in an area.