Magic Items

Wondrous item, legendary (requires attunement by a wizard)
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.

A small iron casket among the oni's belongings holds a gift to the Lord of Oni-a trick box made out of eighteen plates of platinum, eighteen plates of electrum, and eighteen plates of silver. The box is opened by sliding certain plates on the left side, then the top, then the right side in a particular sequence. The correct order is platinum-electrum-silver on each end, and silver-electrum-platinum on the top.
The box has properties similar to those of a bag of holding-although the container is but 10 inches long by 6 inches wide and 4 inches deep, it holds 3 cubic feet of material or 60 pounds, whichever is the lesser.

When the creature hits with a weapon attack, that attack also deals 5 (2d4) poison damage.

Wand, rare (requires attunement by a spellcaster)
This wand has 7 charges for the following properties. It 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.
Spells. While holding the wand, you can use an action to expend some of its charges to cast one of the following spells (save DC 17): hold monster (5 charges) or hold person (2 charges).
Assisted Escape. While holding the wand, you can use your reaction to expend 1 charge and gain advantage on a saving throw you make to avoid being paralyzed or restrained, or you can expend 1 charge and gain advantage on any check you make to escape a grapple.