Shifters Bane

Although this potion smells strongly like rotten eggs when the bottle is opened, it will match the smell and taste of whatever food or drink it is added to, making it virtually undetectable. Any shapeshifter that drinks this potion must pass a DC 19 Con Save. If they fail they are forced to take their humanoid form, and cannot revert back for the next 24 hours. If they succeed they have disadvantage on all saving throws for 1 minute.