Shard of Moonlight

Sentience

The Shard of Moonlight is a sentient weapon, with the same personality as the Great One whose flesh it was carved from. The weapon sporadically communicates telepathically with its wielder through images and sounds, though it doesn't speak.

Trick Weapon

As a Bonus Action, you can switch between the Transformed and Untransformed states of this weapon. In its Untransformed state, the shard is a metallic Longsword that absorbs light. In its Transformed state, the weapon is a Greatsword that pulses with lunar energy. In both states, this weapon has the Light property.

Untransformed

The blade seems to guide your strikes. Once on each of your turns when you make an attack with this weapon, you can immediately make a second attack (no action required). It has the Void Absorption property.

Void Absorption

The void that fills the blade is capable of absorbing magic. While holding the shard, you can take a Reaction to absorb a spell that is targeting you, including spells with an area of effect. The absorbed spell's effect is canceled, and the spell's energy—not the spell itself—is stored in the shard in the form of charges. The number of charges gained is equivalent to the level of the spell when it was cast (1 charge for cantrips). The shard can absorb and store up to 10 charges. If the shard doesn't have enough empty charges for a spell, it fails to absorb it. The shard regains all charges each time the moon changes.

Transformed

To transform the blade, you must take a Bonus Action while under direct moonlight. The transformation lasts for 1 minute, or until you end it early as a Bonus Action. While the blade is Transformed, the extra Radiant damage it deals on a hit increases from 1d6 to 2d6, and you can expend the charges stored within the shard. When the shard loses all charges, the transformation ends. Each time you make an attack in the Transformed state, you can expend charges to create special effects: