YouTuber Sufficiently Advanced is great at building items that previously only existed in fanboy dreams (see his electromagnetic Mjonir for example). Now he's back with a weapon that has captivated fantasy and RPG fans for decades... THE ICE SWORD. 

 

While it's not as pretty Frostmourne or as crystal clear as Sub-Zero's creations, he manages to make a strong, wieldable sword by using an old technology from WWII to succeed where other frozen blades would simply shatter.

 

If you don't care about the science and want to skip right to the smashing, jump ahead to 3:50