Miasma is a part of the Condense Aspect of the Murk Fysa. All tolka start with this fysa.
This is an active fysa. A user can exhale a fine mist of fysa to change the levels of magic and humidity in the atmosphere. This is commonly used to affect the weather to provide ideal conditions for agriculture. Many tolka work together to achieve this.
This mist is different from a mist expelled by Immanu-- immanu mist has specialized effects, while a tolka's miasma works more naturally.