The Boss trait from Teamfight Tactics Set #4.5

When The Boss first drops below 40% Health, he leaves combat to start doing sit-ups. Each sit-up restores @HealPercent@% of his maximum Health and gives him @AttackSpeedPercent@% Attack and Movement Speed. If he reaches full Health he returns to combat Pumped Up: all of his attacks and spells deal true damage. If all of his allies die, he will immediately return to combat.