Greatsword, Legendary (requires attunement by a level 15 or more figther )
You gain a +2 bonus to Attack and Damage Rolls made with this Magic Weapon. While you hold the drawn sword, it creates an aura in a 10-foot radius around you. You and all creatures friendly to you in the aura have advantage on Saving Throws against Spells and other magical Effects. You can cast the Calm Emotions spell with this sword once per long rest. Saving throws to resist the spell cast this way have disadvantage.