Shards of Sehanine
Wondrous Item, Uncommon.
The Sharpening Sheath is a sheath for bladed weapons inset with rubies on the hilt. Any blade drawn from this sheath seems to have a sharper edge for a few moments, just enough to strike a blow that could leave most foes reeling.
When a weapon that deals slashing or piercing damage is drawn from this sheath, it makes its next attack roll within six seconds with Advantage on that attack roll only. Once this effect has been triggered, the ability can not be used until the wielder has taken a long rest.
AC 13, 7 HP.