Potion of Necrotic Servitude

Potion, Very Rare (Attunement Optional)

Only a creature that knows the properties of this potion can attune to it.

A creature that ingests this potion suffers no effect until the stroke of midnight. If the potion has not been neutralized before then, the creature must succeed on a DC 17 Constitution saving throw, taking 42 (12d6) necrotic damage on a failed save, or half as much damage on a successful one.

If this damage reduces the creature to 0 hit points, it dies and rises as a Wight after 1 minute. If a creature is attuned to the potion when it is consumed, the Wight is permanently under the attuned creature's command, following its verbal orders to the best of its ability.

If no creature is attuned to the potion when it is consumed, the Wight is hostile to all non-undead creatures it sees.