Hazirawn

Hazirawn is a sentient (neutral evil) greatsword, capable of speech in Common
and Netherese.
Even if you aren't attuned to the sword, you gain a +1 bonus to attack and damage rolls
made with this weapon. If you are not
attuned to Hazirawn, you deal an extra 1d6 necrotic damage when you hit with the
weapon.