Necromantic Box

Wondrous item, legendary (requires attunement)

The necromantic box is a potent magical receptacle designed to contain the bodily remains of a single dead creature. The box can hold only one creature’s body, regardless of size. The box can be opened or closed and sealed as an action. However, the box cannot be sealed if there are more than one creature’s remains within it. The interior and opening of the box magically resizes to accommodate adding or removing a body of up to Gargantuan size, but it otherwise retains its normal dimensions of 2 feet wide by 4 feet long and 2 feet tall.

While sealed, the necromantic box and any remains inside it are protected from all divination spells. No divination spell except those employed by the gods can detect the necromantic box or the remains within it. Regardless of what it is constructed from, a lich’s phylactery or other object that contains a soul counts as bodily remains when placed in the box. Any other equipment or objects within the box which are not a creature’s bodily remains can be detected normally. While within the box, any creature’s remains are under the effects of a gentle repose spell.

If the body of a creature killed within the last minute is placed in the box and the box closed and sealed, the creature’s soul is trapped in the box and that creature cannot be brought back to life until the box is reopened. If the physical remains of an undead creature which has been destroyed within the last week (including a ghost which has been laid to rest) are sealed in the box for 1 full week then the undead creature is returned to unlife at the end of the week, provided the creature’s soul hasn’t been restored to life in the meantime. The newly revivified undead creature initially has a number of hit points equal to its current HD and loses all currently prepared spells or unused spell slots.