PFSRD:Scabbard Of Keen Edges
From D&D Wiki
|This material is published under the OGL|
Price 16,000 gp; Aura faint transmutation; CL 5th; Weight 1 lb.
This black scabbard is engraved with intricate silver runes that depict all manner of bladed weapons. A scabbard of keen edges can shrink or enlarge to accommodate any knife, dagger, sword, or similar weapon up to and including a greatsword. Up to three times per day on command, the scabbard casts keen edge on any blade placed within it. Runes similar to those on the outside of the scabbard appear on a blade while it is under this keen edge effect.
Cost 8,000 gp