Dust of Death

For the duration of the spell, you transform one ounce of normal sand into deadly poison (enough to affect just one creature). The poison is a fine powder that can be sprinkled on food or stirred into a drink. When mixed this way, it is difficult to detect; a successful Wisdom (Perception) check against your spell saving throw DC is needed to notice the poison before enough has been ingested to cause harm. Only the creature that is eating or drinking the poison can attempt this check, and only if they are suspicious of the food or drink. If the victim doesn’t suspect the food is contaminated, no check is allowed.

A creature that consumes the poison is poisoned must make a Constitution saving throw against poison at the end of each of its turns. The creature takes 6d6 poison damage if the saving throw fails, or half damage on a successful save. A creature that makes two successful saving throws is no longer affected by the poison; it still takes half damage from the second successful save, but then the poison is neutralized. The successful saves don’t need to be consecutive.