The Cursed Sword is a sword-type meleeweapon that has extremely high DPS, constant critical hits and a fast swing rate, but makes the player cursed as long as it is equipped.
There is an achievement associated with this weapon called "I like to live dangerously...", which is achieved by completing a run with the sword in possession.
The weapon's curse mechanic remains active even if it is merely held in the backpack (and therefore technically not "equipped" in the usual sense). The curse effect can only be escaped by dropping the weapon entirely.
There is a bug involving holding this item in the backpack. Unless you drop it by holding interact, the curse will not be removed; even if you swap it to an active slot, and then drop it by swapping to another weapon.
Unlike a curse from a cursed chest, equipping it does not prevent the player from using Homunculus Rune and does not trigger the crit damage condition of Spite Sword.
Ygdar Orus Li Ox will not be triggered when killed with this weapon in your inventory.
The Damned aspect can partially negate the weapon's drawback by causing curses to instead double the damage taken or dealt by the player.