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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. The player does not need to complete the main quest to use it for the match since the final boss fight happens only when talking to Pam Grier before entering the Rat King's lair.
Despite being a grenade, it is not thrown. Instead, the player raises the heart and squeeze it, after that, all nearby zombies will violently explode in a burst of rat and blood. The equipment has 1 charge but can be used multiple times. The Heart deals infinite damage.[source needed]