Weapon (longsword or shortsword), artifact (requires attunement by a creature of good alignment)
The Master Sword is a holy blade forged by ancient deities and blessed by the goddess Hylia herself. Rumors suggest this weapon can only be wielded by master warriors of light, and that its edge is forged from a mystic metal capable of cleaving through almost anything. The blade is infamous among followers of Ganon, and any creatures aligned with this king of evil will always be openly hostile towards anyone in possession of this sword.
Sword of Hylia. You can choose to wield this sword as either a longsword or a shortsword. It is immune to effects that corrode or damage metal, and is utterly indestructible.
Pact of the Silent Hero. While you are attuned to this magic weapon, you have a +3 bonus to attack and damage rolls made with it, and any hit you make with it deals double its normal damage dice (2d6, 2d8, or 2d10 depending on how it is wielded) against any creature not of a good alignment. You also, however, have disadvantage on any Charisma checks which involve spoken words.
Spells. While you are attuned to this sword and are wielding it, you can use an action to cast one of the following spells from it: light (on the Master Sword only), power beam, or spin attack. For power beam and spin attack, you make a melee weapon attack roll with the Master Sword in place of a melee or ranged spell attack roll.
Blade of Evil's Bane. When an immortal creature or deity of evil alignment is reduced to 0 hit points, the Master Sword can be used to prevent any effect from causing that creature to regain hit points or otherwise return to life. This ritual requires that a piece of the creature's body be placed in a stone pedestal specifically designed to hold the Master Sword, and the sword itself be sheathed over that piece of the creature's body. While the sword is sheathed, the pedestal on which it stands cannot be destroyed, and the sword cannot be unsheathed by a creature unless that creature is attuned to it. Unsheathing the sword ends this effect. If the sword becomes nonmagical, the effect similarly ends.
Destroying the Master Sword. Although there is no known way to destroy the the Master Sword outright, its power erodes with the the passage of time. If the weapon is not wielded for 10d100 years, its 'Pact of the Silent Hero' and 'Spells' features are subdued. In yet another 10d100 years, the 'Blade of Evil's Bane' feature erodes. Finally, after 10d100 years the Master Sword becomes indistinguishable from a nonmagical sword.
Each increment of this degradation can only be undone with a direct blessing by a deity of good alignment. A deity can only undo one stage of degradation at a time. Once a deity has blessed the Master Sword to restore some of its power, that deity cannot do so again until the sword's power is either fully restored or fully depleted.
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