Shrieking Chalk (Patreon)

Wondrous item, rare

This piece of chalk doesn't make any marks when used to write with. Instead, it only releases an ear-splitting shriek, which is audible out to a range of 300 feet. You can use an action to scrape the chalk against a solid surface within your reach. When you do, any creature that can hear the chalk within 30 feet of it must make a DC 13 Constitution saving throw. On a failed save, a creature takes 2d10 psychic damage and is incapacitated until the start of your next turn, as it's overwhelmed by the horrific sound. On a success, a creature takes half as much psychic damage and isn't incapacitated. If a creature is holding anything when it fails the saving throw, it immediately drops what it's holding and cover its ears (provided that it has them). Creatures that have a trait which grants them advantage on Wisdom (Perception) checks that rely on hearing have disadvantage on this saving throw.

There's enough chalk for three uses. It grows smaller with each use. Once the chalk is used a third time, any remaining fragments are turned to dust and destroyed.

SkrieEEEeEEeeeEEeeEEeeeEEechhhhhh