Elven Longblade

Weapon (longsword), rare (requires attunement by an elf or half-elf)

This single-edged blade of elven make is lighter than most longswords. It has a disk-shaped guard, and its hilt is wrapped with leather strips in an ornate pattern.

You have a +1 bonus to attack and damage rolls made with this weapon, which has the finesse property. When you are hit with a melee attack while you hold this weapon and no other weapon or shield, you can use your reaction to add your proficiency bonus to your AC, potentially causing the attack to miss you.