The magic can manipulate the density of matter regardless of whether it is a solid, liquid, or gas. It can be used to do the following:
It can be used to create a high-pressure liquid flow by manipulating the density of a liquid.
To reverse a liquids flow in order to defy the force of gravity.
It can be used to manipulate the density of gases in the air to create strong gusts by releasing pressurized air.
This magic can be used for a wide range of situations when applied. Katsushige's high invocation speed, the huge number of invocations he can manage, and the huge scale at which he can alter phenomena makes allows him to be a "jack-of-all-trades" with this magic.