User can to create or wield weaponry with power over curses, which grants the user a wide variety of curse-based abilities. This ability is not only specific to mystic weapons, but also technologically advanced weapons. The power of the weapons depends on what they were created for or what level of curse-based ability they possess.
Legendary Demon Swords such as Gram (Highschool DxD) are imbued with a powerful curse that drains the life of their wielders.
Roronoa Zoro's Sandai Kitetsu (One Piece)
The Shichiseiken (One Piece: The Cursed Holy Sword) is a cursed sword whose history is shrouded in bloodshed. It grants immense power to its wielder, and heals any wounds on the user, but corrupts their mind and conquers them.
The Cursed Blades of Vengeance (Teenage Mutant Ninja Turtles 2012), which curse whoever they cut.