5e SRD >Gamemastering >Magic Items >Magic Items by Other Publishers >Magic Items – David Barrentine >

Whetstone of Polish

Wondrous item, uncommon

If a creature spends a short rest using this stone to sharpen a blade, the next blow they land with that weapon is treated as a critical hit. This can only sharpen one weapon on a short rest or up to 3 weapons on a long rest. After it has been used 10 times the stone breaks and can no longer sharpen blades.

Section 15: Copyright Notice

Knights of the Shadow Realm, Copyright 2020, David Barrentine