As two actions, you can create this bomb. As an action, a creature can throw this bomb at a point within 5 meters, where it explodes on impact. A billowing mass of icy and misty vapors spreads to fill a sphere for the duration. The sphere spreads around corners, and its area is heavily obscured. It lasts for the duration or until a wind of moderate or greater speed (at least 15 kilometers per hour) disperses it. A creature that enters the spell’s area for the first time on a turn or starts its turn there must make a Fortitude saving throw.
On a failure, it takes 3d4 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 1d4 for each additional catalyst expended. If you expend 4 or more catalysts, the slowed level increases to 2.
You can expend 1 additional mana so the duration changes to 1 hour/catalyst.