Of all the weapons in Breath of the Wild, the Guardian gear must be the hardest for a prop-maker to recreate properly. Yet here we are, with a replica Guardian Sword, blue glow and all.
This full-scale replica built by Adafruit Industries, which is 34 inches long, was 3D printed and is full of tiny little LEDs to give it that sweet lighting effect.
If you want to try and build one yourself, or just see how this one was made, Adafruit have a making-of guide on their site.