Try one in your world today
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The “Sword of Instant Regret”. It does 100% DMG, but only stabs the wielder.
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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.
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Alternatively, rolling a 1 makes you roll the damage against yourself, but it’s a permanent loss of max HP as a psychic effect. It kills you if you hit 0 max HP. Anything that would let you recover the max HP, like straight-up wish (greater restoration isn’t good enough) also makes the dagger not work for you any more because you cheated.
With the cheating stipulation I’d personally let greater restoration work too.
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Sounds really useful actually.
Emphasis on anything. I doubt the inkeeper will take kindly to being paid with coins folded in half.
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Cube of instant castle: Say the keyword ‘open’ to transform this cube into a '200x’200 castle. The transformation happens instantly, and if you’re caught in the area of effect, be prepared to get smashed. The cube is hard of hearing.
I’ll use a sending stone like a garage door opener as I’m pulling up in the carriage
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With the cheating stipulation I’d personally let greater restoration work too.
I re-read greater restoration, because 5e was never really my game (3.5), and saw one of its uses was explicitly to end one effect reducing your hit point maximum. So I’d amend my earlier and say yeah, that spell works. Since my reading is that it’d only reverse a single crit fail’s penalty per casting - not to mention the spell has a smallish material component cost (100 gp diamond) - the weapon wouldn’t call it cheating, per se.
As the dagger’s main thing is that it’s a 1d6 instead of 1d4, that’s only +1 point of damage per hit on average. 1 in 20 hits backfires, so essentially the cost for 19 extra damage over 19 hits per penalty taken, reversing just the one with a 5th level spell… there’s better ways to do 19 damage with a 5th level spell, so probably not really cheating

Correct if I’m misremembering the general benefits of the sapient dagger.
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Bag for holding:
It’s a bag of holding but instead of occupying a bag slot it must be kept in the main hand.
Bag of handholding
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Cube of instant castle: Say the keyword ‘open’ to transform this cube into a '200x’200 castle. The transformation happens instantly, and if you’re caught in the area of effect, be prepared to get smashed. The cube is hard of hearing.
Excellent weapon then
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Bag of handholding
?Handbag of holding
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Helm of Invincibility: you are invincible, but only to people who have Vince in their name, e.g. Vince, Vincent, some other name with Vince
Also resistant to a single Vance (yes, that one) due to a pronunciation error during casting
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How do I delete someone else’s comment?
Become a moderator
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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.
If staff of disintegrating can be activated remotely you can make traps with it
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Skull of Corruption: It can do damage, but most of the time to your invaluable backup files.
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Sword with fire enchantment, fire has no regulator and cannot be turned off.
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.
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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.
Not accidentally holding a strangers hand. This is the worst one by far.
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Flail of Flatulence: deals an additional 1d4 of embarrassment to the target while dealing 1d4 of gas damage to everything within 6 meters.
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I might actually steal that cloak for my D&D campaign lol
I’m flattered. They’re fun things to come up with. -
I was thinking something like flight but only in directions away from enemies.
Cape of (White) Flight could be fun, too.
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Bag of holding, but everything that goes in comes out a crocheted plushie version.
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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.