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.

Rod, rare (requires attunement), Table G

Made by the drow, this rod is a magic weapon that ends in three rubbery tentacles. While holding the rod, you can use an action to direct each tentacle to attack a creature you can see within 15 feet of you.

Each tentacle makes a melee attack roll with a +9 bonus. On a hit, the tentacle deals 1d6 bludgeoning damage. If you hit a target with all three tentacles, it must make a DC 15 Constitution saving throw.

On a failure, the creature's speed is halved, it has disadvantage on Dexterity saving throws, and it can't use reactions for 1 minute. Moreover, on each of its turns, it can take either an action or a bonus action, but not both. At the end of each of its turns, it can repeat the saving throw, ending the effect on itself on a success.
This item can be found on page 208 of the Dungeon Master's Guide.

Wondrous item, very rare This book contains intuition and insight 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 Wisdom score increases by 2, as does your maximum for that score. The manual then loses its magic, but regains it in a century.

This axe's handle is carved with leaves and vines, and the weapon weighs half as much as a normal battleaxe. When the axe hits a plant, whether an ordinary plant or a plant creature, the target takes an extra 1d8 slashing damage. When a creature of non-good alignment wields the axe, it sprouts thorns whenever its wielder makes an attack with it. These thorns prick the wielder for 1 piercing damage after the attack is made, and this damage is considered magical.

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.