Assassin's Draft

6th-level transmutation
Casting time: 1 action
Range: 20 feet
Target: A single container you can see within range
Components: V, S, M (a topaz worth 250 gp, which the spell consumes
Duration: Concentration, up to 10 minutes
Classes: Warlock
Subclasses: --

You contaiminate the contents of a sinle container you can see within range that contains no more than 10 ounces of liquid or food with poison. The contaminated food or beverage looks and tastes unchanged but carries a slightly acrid aroma for the duration. A creature that wishes to eat or drink from the containeer can attempt a Wisdom (Perception)check opposed by your spell save DC to detect the virulent poison. A creature who ingests the contaminated food or beverage must succeed on a Constitution saving throw, taking 20d12 poison damage on a failed save or half as much on a successful one.