Rat King's Heart

The Rat King's Heart is a powerful lethal grenade exclusive to Shaolin Shuffle. It is obtained by beating the Rat King for the third time during the Pest Control main quest. You don't need to complete the main quest to use it for the match since the final boss fight happens only when you talk to Pam Grier before entering the Rat King's lair.
Despite being a grenade, you do not throw it. Instead, the character raises the heart and squeeze it, after that, all nearby zombies will violently explode in a burst of rat and blood. The "grenade" has 1 charge but in fact you can use it multiple times. The Heart seems to deal infinite damage, but if not, the Heart still does very very high amounts of damage.
Category:Call of Duty: Infinite Warfare Lethal Equipment