Death Dog

The monster makes two attacks.

. . If the target is a creature, it is subjected to the following effect.
Constitution Saving Throw: DC .
First Failure: The target has the Poisoned condition. While Poisoned, the target's Hit Point maximum doesn't return to normal when finishing a Long Rest, and it repeats the save every 24 hours that elapse, ending the effect on itself on a success.
Subsequent Failures: The Poisoned target's Hit Point maximum decreases by 5 ().