Soul-guide Lantern

Wondrous item, uncommon

Price: 100-750 gp | low sentimentality

When lit, any undead creature with a challenge rating of 1 or lower that comes within 60 feet of the lantern becomes unconscious until it’s no longer within 60 feet of the lantern or the lantern extinguishes, whereupon it wakes prone if it has more than 0 hit points.

Paid

Undead creatures with a challenge rating higher than 1 must succeed a Wisdom saving throw (DC 15 - their challenge rating) or suffer the same effects from the lantern as undead creatures with a challenge rating of 1 or lower.

Overpaid

The lantern has 3 charges, which are used to fuel the magic it contains. With the lantern in hand, you can use your action to expend 1 charge to cast the banishment spell (save DC 15, no concentration required) on an undead creature. While a creature is banished by the lantern, you can’t use the lantern to cast banishment again and the lantern glows with an ethereal white light that casts bright light in a 15-foot radius and dim light for an additional 30 feet. The lantern regains all expended charges daily at dawn.

Source: The Gray Merchant of Asphodel