Ceremonial Weapon

Formshift. You have a +3 bonus to attack and damage rolls made with this magic weapon. You can choose to use Strength or Dexterity for the attack and damage rolls of melee attacks using this weapon, and regardless of the weapons form or type, the weapon's damage die becomes a d10. This weapon's default form is a longsword, but can transform into any simple or martial weapon the attuned user wishes. Doing this require using your bonus action, and can be done every turn. 

Basic Enchantment. You can use a bonus action to speak this magic sword's command word, causing the runes along the blade to shine brightly. This light sheds dim light for 30 feet. While the sword is alight, it deals an extra damage to any target it hits. The light last until you use a bonus action to speak the command word again or until you drop or sheathe the sword. You can choose one of the following enchantment options to have your weapon be affected by. You can swap this enchantment each long rest, if you choose. You can only have one active at a time.
1. Flamebrand. Your weapon deals an extra damage dice of fire damage. 
2. Thunderbrand. Your weapon deals an extra damage dice of thunder damage. 
3. Frostbrand. Your weapon deals an extra damage dice of cold damage. 
4. Bloodbrand. Your weapon deals an extra damage dice of necrotic damage. 
5. Lightbrand. Your weapon deals an extra damage dice of radiant damage. 

Favored Foe. Choose a type of favored enemy: aberrations, beasts, celestials, constructs, dragons, elementals, fey, fiends, giants, monstrosities, oozes, plants, or undead. Alternatively, you can select two races of humanoid (such as gnolls and orcs) as favored enemies. You deal max damage when you strike an enemy that has the same type as your favored foe. 

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This weapon was created by a grand archmagus; Cameron the Clairvoyant. It was an artifact and relic of the Blades, a group of templars in the world of Tamriel. The Blades are the former protectors of the Emperors of Tamriel. In the First Era, however, the Blades began as dragon hunters known as the "Dragonguard." After the return of Alduin and the beginning of the Dragon Crisis, the Blades took on this role again. After the events of the Oblivion Crisis and the Great War, their order began to rapidly decline. The few remnants of this once-glorious order have gone into hiding and are being hunted by the Thalmor after their near-extermination by the Aldmeri Dominion.

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: a creature able to wield both simple and martial weapons with proficiency, and have all stat scores be at least 10, Versatile, Sap