Alchemical flask

You temporarily transmute base alchemical reagents into their finished product and then throw them at a creature or object before the magic wears off. Select acid, cold, fire, lightning, or poison, for the type of flask you create, and then make a ranged spell attack against the target. If the attack hits, the creature takes 1d8 damage of the type you chose and at the start of its turn, it takes an additional 2d4 of the chosen type. A creature can end this additional damage by using its action to make a Dexterity saving throw against your spell DC to remove the substance.