You have a permanent +10 bonus on attack and damage rolls exclusively on chromatic dragons or Tiamat. The damage also dealt with this sword is permanent and never can be undealt. This is because of several centuries of magic spells and enchantments boosting its power for its true foe.
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, Immunity: Fire, Immunity: Lightning, Only a storm giant or fire giant of at least 20th level as a fighter and spell caster, Damage, Buff, Combat, Sentient, Symbiotic, Heavy, Two-Handed, Graze
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