Jack_of_shadows
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Perhaps the monster's name wasn't assigned? Check the "name" field. It should be the same as the name specified in the script. And if, instead of dying, the monster glitches out and flies in all directions, it means it doesn't have the corresponding animation; you should try a different one (it's a 50/50 chance whether it has one or not. Alternative upgrades are more likely to have a connected animation).