Magic Items

Weapon, legendary (requires attunement by a creature of the weapon's choice)
Martial weapon, melee weapon
3 lb.

1d8 Slashing
Versatile (1d10)
Mastery: Sap

Of all the magic items created by elves, one of the most prized and jealously guarded is a Moonblade. In ancient times, nearly all elven noble houses claimed one such weapon. Over the centuries, some of these weapons have faded from the world, their magic lost as family lines have become extinct. Others have vanished with their bearers during great quests. Thus, only a few of these weapons remain.

Every Moonblade longs for a bearer whose disposition and goals are compatible with its own. If you try to attune to a Moonblade that doesn't want you as its bearer, the weapon not only rejects you but also places a curse on you, causing you to make D20 Tests with Disadvantage for 24 hours or until the curse is ended by a Remove Curse spell or similar magic. If you're accepted by the weapon and try to attune to it, you become attuned to it instantly, and a new rune appears on it. You remain attuned to the weapon until you die or the weapon is destroyed. A Moonblade functions like a nonmagical weapon of its kind for anyone other than its chosen bearer.

A Moonblade has one rune on it for each bearer it has willingly served (typically 1d6 + 1). The first rune grants a +1 bonus to attack rolls and damage rolls made with this magic weapon. Each rune beyond the first grants the Moonblade an additional property. The DM chooses each property or determines it randomly by rolling on the Moonblade Properties table.

Beacon. You can take a Bonus Action to cause the item to shed Bright Light in a 10-foot radius and Dim Light for an additional 10 feet, or to extinguish the light.

Sentience. A Moonblade is a sentient weapon with an Intelligence of 12, a Wisdom of 10, and a Charisma of 12. It has hearing and Darkvision out to 120 feet. Its alignment matches that of its creator.

The weapon communicates by transmitting emotions, sending a tingling sensation through the wielder's hand when it wants to communicate something it has sensed. It can communicate through visions or dreams when the wielder is either in a trance or asleep.

Personality. A Moonblade has a personality similar to that of its creator. Once a Moonblade has decided on an owner, it believes that only that person should wield it, even if the bearer's alignment differs from that of the weapon's or the bearer's goals later clash with the weapon's goals.

Moonblade Properties
You have a +3 bonus to attack and damage rolls made with this magic weapon.
This magic weapon deals an extra 3d6 force damage to any creature it hits.
The Moonblade scores a Critical Hit on a roll of 19 or 20 on the d20.

Spell Storing.
This sword stores spells cast into it, holding them until the attuned wearer uses them. The ring can store up to 5 levels worth of spells at a time. When found, it contains 1d6 - 1 levels of stored spells chosen by the DM.
Any creature can cast a spell of level 1 through 5 into the ring by touching the sword as the spell is cast. The spell has no effect other than to be stored in the ring. If the sword can't hold the spell, the spell is expended without effect. The level of the slot used to cast the spell determines how much space it uses.
While wearing this sword, you can cast any spell stored in it. The spell uses the slot level, spell save DC, spell attack bonus, and spellcasting ability of the original caster but is otherwise treated as if you cast the spell. The spell cast from the ring is no longer stored in it, freeing up space.

Mastery: Sap. If you hit a creature with this weapon, that creature has Disadvantage on its next attack roll before the start of your next turn.