I was looking at the piercer and noticed that it's attack not only has a Hit outcome, but a Miss line as well that is both fun and fits the attack. As far as I can tell, the piercer is the only creature like this in the Monster Manual.
What other monsters have specified Miss outcomes for their attacks/actions?
I've found a few more using the search function on DnD Beyond, but there aren't many.
In addition to the Piercer, there's also:
A Kobold Inventor which has a Miss effect when it throws a Green Slime Pot as part of its Weapon Invention action. Published in Volo's Guide to Monsters.
Zorak Lightdrinker who has a Hit or Miss effect after making a weapon attack. Published in Waterdeep: Dungeon of the Mad Mage.
A Fluxcharger which has a Hit or Miss effect when it uses its Arc Lightning action. Published in Guildmasters' Guide to Ravnica.
The only other one I could find with a "Miss:" result was the kobold inventor's Green Slime Pot:
Hit: The target is covered in a patch of green slime. Miss: A patch of green slime covers a randomly determined 5-foot-square section of wall or floor within 5 feet of the target.
I used this D&D Beyond search to find this. Note there is also Zorak Lightdrinker and Fluxcharger which have a different "Hit or Miss:" option.
