They should rework cannibalism to be more balance and give it to Aatrox
Cannibalism was Sion old ult the only thing is than people would just for full crit and heal like crazy with 100% life steal that part might be too crazy but the part that should be given to Aatrox is that he would heal surrounding allies.
R Cannibalism For 20 seconds, Sion gains bonus lifesteal and 50% attack speed. Additionally, Sion's basic attacks will heal surrounding allies for a percentage of the damage dealt. BONUS LIFE STEAL: 50 / 75 / 100% HEAL TO NEARBY ALLIES: 25 / 37.5 / 50% AOE HEAL RADIUS: 200