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BLOODLUST is a modular wounds system for urban fantasy TTRPGs - specifically for games that feature monstrous player characters such as vampires and werewolves. It might be MOSAIC Strict or something.  Use this in place of HP, harm, or whatever system your RPG uses for when PCs get hurt.  When using BLOODLUST, whenever a character gets injured their instincts kick in, bringing out their monstrous side and making them even more dangerous. But embracing the bloodlust comes with a risk, go too far and they'll lose what makes them human forever and be devoured by their true nature.