Item Type: Weapon

Item Subtype: Longsword

Item Rarity: Rare

Requires Attunement: Yes

D&D Beyond: Sun Blade

Source: Dungeon Master’s Guide

Consumable: No

This item appears to be a sword hilt.

Blade of Radiance. While grasping the hilt, take a Bonus Action to cause a blade of pure radiance to spring into existence or disappear. While it exists, this magic weapon functions as a Longsword with Finesse. If you’re proficient with Longswords or Shortswords, you’re proficient with the Sun Blade.

You gain +2 to attack and damage rolls made with it, and it deals Radiant damage instead of Slashing. When you hit an Undead, it takes an extra 1d8 Radiant damage.

Sunlight. The luminous blade emits Bright Light in a 15-foot radius and Dim Light for another 15 feet. The light is sunlight. While the blade persists, take a Magic action to expand or reduce each radius by 5 feet, to a maximum of 30 feet each or minimum of 10 feet each.