Sonic the Hedgehog vs. Shadow the Hedgehog with healthbars

Sonic abandons Tails and Knuckles, steals the Master Emerald, and becomes superpowered using the seven Chaos Emeralds contained within. Sonic confronts Shadow, who also absorbs the Chaos Emeralds' energy to become superpowered. Sonic eventually overpowers Shadow but relents upon realizing he was being consumed by revenge.