Magic Items

Wondrous item, uncommon (requires attunement)
While this polished agate is on your person, you gain a +1 bonus to ability checks and saving throws.

Source: Dungeon Master's Guide
Weapon (any sword), uncommon (requires attunement)
You gain a +1 bonus to attack and damage rolls made with this magic weapon.
Curse. This sword is cursed and possessed by a vengeful spirit. Becoming attuned to it extends the curse to you. As long as you remain cursed, you are unwilling to part with the sword, keeping it on your person at all times. While attuned to this weapon, you have disadvantage on attack rolls made with weapons other than this one.
In addition, while the sword is on your person, you must succeed on a DC 15 Wisdom saving throw whenever you take damage in combat. On a failed save, you must attack the creature that damaged you until you drop to 0 hit points or it does, or until you can't reach the creature to make a melee attack against it.
You can break the curse in the usual ways. Alternatively, casting Banishment on the sword forces the vengeful spirit to leave it. The sword then becomes a +1 weapon with no other properties.

Source: Xanathar's Guide to Everything

Wondrous item, common

This tankard has a stern face sculpted into one side. You can drink ale, wine, or any other nonmagical alcoholic beverage poured into it without becoming inebriated. The tankard has no effect on magical liquids or harmful substances such as poison.

The stern face sculpted into the side of this tankard is that of a human man in his late 30s with a finely groomed mustache and beard, and a monocle.

Wondrous item, very rare

This book contains memory and logic exercises, and its words are charged with magic. If you spend 48 hours over a period of 6 days or fewer studying the book's contents and practicing its guidelines, your Intelligence score increases by 2, as does your maximum for that score. The manual then loses its magic, but regains it in a century.

Wand, very rare (requires attunement by a spellcaster)

This wand has 7 charges. While holding it, you can use an action to expend 1 of its charges to cast the polymorph spell (save DC 15) from it.

The wand regains 1d6 + 1 expended charges daily at dawn. If you expend the wand’s last charge, roll a d20. On a 1, the wand crumbles into ashes and is destroyed.

Wand, uncommon

The wand has 3 charges. While holding it, you can use an action to expend 1 of its charges, and if a secret door or trap is within 30 feet of you, the wand pulses and points at the one nearest to you. The wand regains 1d3 expended charges daily at dawn.

The wand has 3 charges. While holding it, you can use an action to expend 1 of its charges, and if a secret door or trap is within 30 feet of you, the wand pulses and points at the one nearest to you. The wand regains 1d3 expended charges daily at dawn.

Beacon Property

Beacon. The bearer can use a bonus action to cause the item to shed bright light in a 10-foot radius and dim light for an additional 10 feet, or to extinguish the light.