Bag of Bones

This bag has an interior space considerably larger than its outside dimensions, roughly 2 feet in diameter at the mouth and 4 feet deep. The bag can hold up to 500 pounds, not exceeding a volume of 64 cubic feet. The bag weighs 15 pounds, regardless of its contents. Retrieving an item from the bag requires an action.

This bag can only hold dead organic matter for the purposes of necromantic spells and rituals. A body can be pulled from the bag an amount of times equal to your proficiency bonus each day. Each time you pull a body from the bag, there is a small chance that a hostile undead emerges. Roll a d20 each time you pull a body from the bag. On a 1 or 2, an undead emerges that is hostile to you and your allies. Once defeated, this undead cannot be used for the purposes of the Animate Dead spell.

If the bag is overloaded, pierced, or torn, it ruptures and is destroyed, and its contents are scattered in the Astral Plane. If the bag is turned inside out, its contents spill forth, unharmed, but the bag must be put right before it can be used again.

Placing a bag of bodies inside an extradimensional space created by a handy haversack, portable hole, or similar item instantly destroys both items and opens a gate to the Astral Plane. The gate originates where the one item was placed inside the other. Any creature within 10 feet of the gate is sucked through it to a random location on the Astral Plane. The gate then closes. The gate is one-way only and can’t be reopened.

At level four, the Bag of Bodies empowers the undead you create. Any body you use from the bag for the purpose of the Animate Dead spell deals magic damage with all of its attacks.