In the TV series Ultimate Spider-Man season 3 also known as Ultimate Spider-Man: Web Warriors when Taskmaster fights Spider-Man he has a glowing sword. Is it a normal sword or is it made of energy or light (like a lightsaber)? What is this sword made up of?
If I had to guess, taskmaster had a shield which was made of pure energy and his sword looks very similar to it, so I’d probs says his sword is almost pure energy. He used one of these https://marvelcinematicuniverse.fandom.com/wiki/Energy_Shield and as mentioned, it has been depicted to look very similar to the sword here https://i.stack.imgur.com/GO98f.jpg
It’s fitting as the shield could “copy” or mimic things like caps shield, so it would also be fitting that his sword could do the same.