Shatterspike
Source: Tales from the Yawning Portal
Weapon (longsword), uncommon (requires attunement)
You have a +1 bonus to attack and damage rolls you make with this magic weapon. If it hits an object, the hit is automatically a critical hit, and it can deal bludgeoning or slashing damage to the object (your choice). Further, damage from nonmagical sources can't harm the weapon.