Ultra Volumetrics v3.3 (5.4)

Ultra Volumetrics is a simple way to add more visually interesting game-ready performant local volumetric fog to any project, with many adjustable parameters and functions for ease of use. With the built-in Paint Mode, you can paint fog where you want it and make it move in any direction. Utilize the power of splines to easily place fog exactly where you want very rapidly without losing functionality and easily animate it. Mix as many Ultra Volumetrics volumes as you want to create interesting effects. Interact with the fog as a player or physics object and generate overlap events.

https://www.fab.com/listings/edddcd05-08c2-4f26-93dd-f1d100dd61fc