Magic Items

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.

Weapon (scimitar), very rare (requires attunement)
You gain a +2 bonus to attack and damage rolls made with this magic weapon.
The sword has 9 charges. If you score a critical hit against a creature that has fewer than 100 hit points, it must succeed on a DC 15 Constitution saving throw or be slain instantly as the sword tears its life force from its body (a construct or an undead is immune). The sword loses 1 charge if the creature is also slain. When the sword has no charges remaining, it loses this property.
The hilt of this weapon is covered with carved, ancient Rellanic runes that seem to comprise nonsensical words or, possibly, a list of proper names.

This leather-bound tome smells of rich mahogany and contains health, fitness, and diet tips, as well as an impressive collection of varied recipes for every occasion. The name “Montague” has been written on the inside front cover, possibly indicating a previous owner. A description of this item can be found on page 180 of the Dungeon Master’s Guide.

This foot-long, twisted iron spike emits a faint coppery scent when channeling magical energies. While holding this wand, you gain a +2 bonus to spell attack rolls. In addition, you ignore half cover when making a spell attack.

Armor (shield), very rare (requires attunement)
This steel shield is embossed with a longsword wrapped in thorny vines which end in roses in full bloom. The enamel coloring the roses is still vibrant.
While holding this shield, you have advantage on saving throws against spells and other magical effects, and spell attacks have disadvantage against you.

The ring appears to be made of smooth gray wooden thorny vines in the loop. A piece of moonstone forms the center of the ring. When the ring's magic is activated, the wearer feels a harmless flash of pain as if his finger is pierced by a thorn - a drop of blood as payment to the Earthmother.

This thick leather-bound volume has a desiccated tongue pinned to the front cover. Five of these tomes exist, and it's unknown which one is the original. The grisly cover decoration on the first tome of the stilled tongue once belonged to a treacherous former servant of the lich-god Vecna, keeper of secrets. The tongues pinned to the covers of the four copies came from other spellcasters who crossed Vecna. The first few pages of each tome are filled with indecipherable scrawls. The remaining pages are blank and pristine.
If you can attune to this item, you can use it as a spellbook and an arcane focus. In addition, while holding the tome, you can use a bonus action to cast a spell you have written in this tome, without expending a spell slot or using any verbal or somatic components. Once used, this property of the tome can't be used again until the next dawn.
While attuned to the book, you can remove the tongue from the book's cover. If you do so, all spells written in the book are permanently erased. This specific tome belongs to Szass Tam, leader of The Red Wizards of Thay. He watches anyone using this tome and can also write cryptic messages in the book. These messages appear at midnight and fade away after they are read.
This item can be found in the Dungeon Master's Guide.

Formed from the severed tentacle of a powerful star spawn, this rod plagues its wielder with dreams of alien creatures that beckon them to travel deep within the Thunder Peaks, where something patiently awaits their arrival. While holding this rod, you gain a +3 bonus to spell attack rolls and to the saving throw DCs of your warlock spells. In addition, you can regain 1 warlock spell slot as an action while holding the rod. You can’t use this property again until you finish a long rest.

This item is a 1-inch cube of compacted slime secreted by Baalzebal when he was in slug form. The slime cube emits a terrible stench when held close to the nose.

Wondrous item, legendary
Originally crafted during the height of the Netherese Empire, this robe is a warm gray color and very plush. It is stitched with silver thread and the back is covered by Rhaugilath’s arcane sigil mixed with the sign of Mystryl.

You stop aging. You are immune to any effect that would age you, and you can't die from old age.

You have wrested away part of Szass Tam’s essence. Specifically, this spark of energy was originally wrested from the vile lich himself, and grants one dditional 9th level spell slot, provided that you already have one. This item can be found in the Dungeon Master’s Guide under the entry for Boon of High Magic.

Wondrous item, legendary (requires attunement by a wizard)
This thick tome contains pages of thin, hammered copper and has thing covers of slate. It is held shut by a severed elven tongue. Occasionally, the attuned user of this spellbook finds messages that have been scrawled by someone claiming to be Netherese; this ghostly writer refers to itself simply as “the warlock” and frequently opines on the power of the one true god of magic: Mystryl.
If you can attune to this item, you can use it as a spellbook and an arcane focus. In addition, while holding the tome, you can use a bonus action to cast a spell you have written in this tome, without expending a spell slot or using any verbal or somatic components. Once used, this property of the tome can’t be used again until the next dawn.
While attuned to the book, you can remove the tongue from the book’s cover. If you do so, all spells written in the book are permanently erased.
Vecna watches anyone using this tome. He can also write cryptic messages in the book. These messages appear at midnight and fade away after they are read.

Harmonius

This great ashen staff is etched with many designs of swirling air and clouds. The staff magically resizes to fit the hand of any who carry it.