A Daemon is a type of psuedo-mundane mystical creature. They have flesh and blood, require food and usually oxygen, and can be killed. They are tainted perversions of living things, infused with demonic energy. They can be quite powerful and some have magical abilities. However, much like demons, they can be warded off with any name of the One King and will flee from symbols associated with Him.
Daemons are related to Fiends and often employ them as servants or henchmen.