This is a custom version of the famous "Master Sword" from the Legend of Zelda series of video games, designed to fit action figures that feature 5mm ports in their hands or on their body, that is not directly based on any one particular version of the sword, though it draws the most influence from the Twilight Princess version. Included with the sword are a pedestal and the sheath, so you have 2 different options of how you want to play with or display/store the sword. In the above images, I have used Hasbro's Deluxe Class Sideswipe figure from the Generations: War for Cybertron - Siege toyline to model this item.
The Sheath is a modified version of the one featured in the link below, shrunken down, slightly modified, and then I also added a 5mm peg on top. The original Sheath model used was designed by Thingiverse user "ChaosCoreTech", so here is a link to that, and please check out their stuff!