Just the worst weapons to ever disgrace a campaign.
The Wiz Whip: a magic whip that deals tremendous elemental damage, but can only be attuned to a wizard.
Shiv of Healing: a small improvised knife deals 3 damage and heals for up to 6 hit points when used to stab someone.
Bruiser Blade: a sword that is unsettlingly colored like skin. As you fight with it, bruises appear on the blade, which heal after a long rest. If the blade becomes entirely covered in bruises, it will break. Adds +1 to intimidation.
Trickshot Bow: a normal-looking bow that will not hit enemies unless it is fired in a cool way, for example, doing a backflip while firing multiple arrows.
Monster Slayer Spear: a spear that is only effective against enemies of high levels. -2 to hit per level on any creature with a CR of 5 or less.
Projectile Perry: a novelty weapon, the Projectile Perry is a brightly colored pouch that produces an endless stream of identical, cannonball-sized garden gnomes. Each Perry is sentient, screams as it is thrown at enemies, and explodes on contact for a total of 3d6 damage.
Darkblade Dagger: a dagger with a black metal blade. It functions as a normal dagger and grants no extra damage, just costs more in a shop.
The Everysword: a well-made but plain looking sword, the type a beginning adventurer might have. Anyone who looks at the blade thinks it might be theirs, stolen by the wielder, and will attack the wielder to get it back (or call the guards, if in a town).
Acid Darts: darts that have been dipped in a strong acid and are slowly corroding. They break on impact, dealing 1d4 acid damage. They also deal 1d4 acid damage to whoever throws the darts, since they are literally dripping in acid.
Blinding Blade: a sword with a brightly glowing blade that, when unsheathed, blinds all creatures present for 2d10 minutes.
11. Necklace of Drowning: causes its own wearer to immediately begin vomiting water and drowning where they stand.