Augment, item and mechanic interactions most players miss in ARAM: Mayhem.
Unlimited health stacking, growing bigger after every takedown, and executing low-health enemies. These three augments turn a tank into the one carrying the team.
Ethereal Weapon makes abilities apply on-hit effects, so they also trigger the cooldown reduction of 
Mystic Punch. Every ability that lands cuts your cooldowns further.
Steel Your Heart triples your Heartsteel stacks, and 
Stackosaurus Rex grants 100% extra permanent stacks. Together, your health grows exponentially.
