Ring of invisibility. Makes you invisible, but makes everyone else invisible to you as well.

I have a spreadsheet full of these somewhere. The 2 that my players got that I remember them using are: Emperors armor: +3 full plate armor with no strength or armor proficiency requirement. When you look at yourself or in a mirror you see yourself in full plate armor, but to everyone else you are naked and if anyone tells you that you are naked the armor and all your possessions cease to exist. My player made it the shopping district in the heart of the city before someone told him. Staff of disintegrating: when activated, it disintegrates. The player that got this one saved it for a boss fight. He found it hilarious though.

Sword with fire enchantment, fire has no regulator and cannot be turned off.

Bag of Communal Holding Content is shared with all other bags of communal holding in existence. Sometimes retrieving objects involves awkward hand contact if someone else is using their bag at the same time.

Sword with fire enchantment, fire has no regulator and cannot be turned off.

I might actually steal that cloak for my D&D campaign lol

I was thinking something like flight but only in directions away from enemies.

Immovable Rod: - Not actually a magical rod. - Actually just a bloke called Roderick, or Rodney, or something to that effect. - Won't move out of your way. - Not even if you ask politely.

Cape of (Refugee) Flight: you gain the power to fly for your life. Screaming Cloak of Invisibility: you're invisible, but the cloak constantly screams, "HE'S OVER HERE!!!" and tries to give away your location. The Tax Axe: raises both your taxes and your target's with every swing.

The Tax Axe might be the most evil weapon ever devised.

Sword II: HAS a regulator but needs to be monitored because using it for too long may melt it. And needs to cool down before sheathing.

Bag of holding, but everything that goes in comes out a crocheted plushie version.

Sir Mix-a-Lot (unrelated) is a traveling potion salesman who shows up for my party at suspiciously specific times, and generally has discounted potions specifically tailored for whatever they happen to be doing at the time. For example, if they need to be really strong, he'll have a bottle of Sir Flex-a-Lot's Magical Muscle Maximizer, which does increase the strength of one's muscles, but not of their bones or connective tissue (it was designed to be used only in bodybuilding competitions), so whenever the drinker does a STR check, they must also make a CON saving throw to avoid breaking a bone or tendon. Need to decipher an ancient text? Try Sir Scripts-a-Lot's Polyglottal-in-a-bottle, which will let you read unknown languages, but also comprehend _all_ unknown languages, even those of the plants and animals around you, making it very difficult to concentrate on any one thing.

Bag of folding. A bag of holding except anything stored in it comes out folded in half.

Wielded correctly, in the hands of someone self-sacrificial, it could rectify many of society's wrongs.

I just thought of the most evil shit you could do with this. They buy the bag and it comes preloaded with a couple lil crocheted trinkets that are cutesy and like grandma made it for adventurers. A lil mealkit, a ration pack, a lil sword and shield but also *a doll.* As they slowly start to realize what the bag does they remember the doll and start freaking out about what if it was a person who went in there to hide and got turned and we gotta fix 'em! Ends up being a whole quest line to unfuck the bag, the bag items and specifically this doll. At the very end they undo the doll and it turns into a wooden doll. Then when laughter/disappointment just getting to the right point, have the doll talk. Get the joke of it being a doll and they get the expectation they wanted of it being a living being they saved.