+3 to damage.
when you make an attack that hits, as a Bonus Action you can teleport behind the target and make a melee attack with advantage with your spellcasting modifier to the hit and damage rolls.
Proficiency with a Greatsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Graze. If your attack roll with this weapon misses a creature, you can deal damage to that creature equal to the ability modifier you used to make the attack roll. This damage is the same type dealt by the weapon, and the damage can be increased only by increasing the ability modifier.
Notes: Heavy, Two-Handed, Graze
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