Chalkboard
From Twilight Heroes Wiki
chalkboard
Plural: walls of a classroom
Back before web classes and even overhead projectors, teachers literally wrote by rubbing rocks together. Unfortunately, pulling "chalk" (one of these rocks, sort of like a stylus if you still use those) across the "chalkboard" (the other rock, which was mounted on the wall so the students could see it) creating the most terrible sound known to mankind.
Miscellaneous Item
Autosell value: 50
Combat Usable
How Obtained
When Used in Combat
Unknown