As an action, you can create a vial of light blue liquid. As an action, a creature can throw the vial at its feet, shattering it on impact. Each creature other than the thrower in a sphere centered on the thrower must make a Fortitude saving throw.
On a failure, it takes 3d6 cold damage, is immobilized, and can’t take reactions until the end of its next turn.
On a critical failure, it takes twice as much damage.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
You can increase the damage by 2d6 for each additional catalyst expended.