Shaedenstaff (Patreon)

Staff, very rare (requires attunement by a sorcerer, warlock, or wizard)

This staff is made from the reclaimed horn of a huge undead creature. While you're attuned to the staff, you have advantage on saving throws to retain your sanity against the environment effects of being in a fallen plane of shadowy existence. The staff can also be used as a magic quarterstaff.

The staff has 15 charges for the following properties and regains 2d6 + 3 expended charges each day at dusk. If you expend the last charge, roll a d20. On a 1, the staff disintegrates in a plume of pitch black smoke and emits a terrifying scream audible out to 300 feet.

Annihilating Strike. When you hit with a melee attack using the staff, you can expend 1 charge to deal an extra 1d10 necrotic damage to the target.

Spells. While holding the staff, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC: calm emotions (1 charge), darkness (2 charges), dispel evil and good (5 charges), inflict wounds (3rd-level version, 3 charges), or circle of death (6 charges).

"The dreariness and cold monotony of that plane of existence never leaves you. You always remember the feeling of being muffled, even when you scream out with intensity. There is no passion there, only gray. The beasts there are the most horrifying things I have ever seen, and this stave is a testament to the evil, and possibility for good, that lives there."
—Excerpt from the journal of the great planar explorer Irina Fletch