As an action, you can create this vial. As an action, a creature can throw the vial at a point within 9 meters, shattering it on impact. Each creature in a sphere centered on that point must make a Reflex saving throw.
On a failed save, a creature takes 3d8 cold damage and is slowed 1 until the end of its next turn.
On a successful save, it takes half as much damage and isn’t slowed.
You can increase the damage by 2d8 for each additional catalyst expended.