You gain a +3 bonus to attack and damage rolls made with this magic weapon. In addition, the weapon ignores resistance to slashing damage.
deals an additional 2d8 to dragontype enemies
When you attack a creature that has at least one head with this weapon and roll a 19 or higher on the attack roll, deal an extra 3d10 slashing damage. a 19 counts as a crit and gains appropriate damage modifiers.
if not attuned this weapon needs to roll a nat 20 in order to add bonus damage
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: Bonus: Magic, requires attunment by a hero who has slew a tarrasque, Damage, Combat, Heavy, Two-Handed, Graze