Scabbard of Keen Edges

Wondrous item, rare (requires attunement)

When you have attuned this scabbard, you can insert any nonmagical sword or dagger into it and have it adapt to the size of that weapon.

When you draw the sword, it is considered magical and gains a +1 bonus to attack and damage rolls for 1 minute. You can use the property of this scabbard three times. It regains spent uses at dawn.

If you have attuned both this scabbard and a magical sword or dagger, when you draw that weapon as a bonus action you can instead cause that weapon to score a critical hit on a natural roll of 19 or 20. It retains this ability as long as you maintain concentration, up to 1 minute.