As an action, you can create a vial of light blue liquid. As an action, a creature can throw the vial at a point within 5 meters, shattering it on impact. Each creature in a sphere centered on that point is affected. At the start of each of its turns for the duration, an affected creature must make a Fortitude saving throw.
On a failure, it takes 2d6 cold damage and is slowed 1 until the end of its next turn.
On a critical failure, it takes twice as much damage and is slowed 2 until the end of its next turn.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
You can increase the damage by 1d6 for each additional catalyst expended.