Item: Skull of Froth; a bath containing the froth generated counts as a Long Rest for Evil creatures and grants a Profane bonus on their Morale for d6 hours, while for Good or Neutral creatures it causes mild skin irritation. (source)
More you might like
Item: Bracelet of Throwing Shot: allows the wearer to throw a bullet or other shot as if they had a gun.
Item: God Jar, containing one deity. When the deity is released, they will grant the responsible party one Wish within the domain of their speciality. I was going to make a d100 chart, but even then there are too many to choose from:
Category: Deities by Association
Item: Frock of Missiles: while it appears to be a standard conservative black dress, once per day the wearer can lift the skirt up and let loose a dozen Magic Missiles.
Item: Camaro of the Crab; as Apparatus of the Crab but +5 Charisma since it’s so cool and half the usual armor class since it’s a convertible. (image source)
Item: Keychain of Footwork: twelve detachable feet that can be removed and ingested to gain +5 on feet-based Dexterity checks (dodging, balancing, moving silently, &c.)
Item: Lenses of Pessimism, causing the wearer to always see the downsides to situations and the worst possible outcomes to situations
An entire pallet of Property Brothers Gnomes
Item: an entire pallet of Handsome-Faced Fixer-Upper Homunculi, ceramic servants that will take a selected building, regardless of condition, and work diligently to upgrade it into a palace.
Item: glass mask that twists the wearer’s features before your very eyes
Surely wearing a mask made entirely of glass into combat will work in your favor