Demons are beings that originate from the plane of Tartarus. They seem to be a mixture of living creature and magic, and are often quite powerful because of this.

They are typically only able to gain freedom through the use of contracts, where they can make agreements with mortals. Naturally most skew things in their own favor, and it is rarely wise to accept a deal without meticulously checking the wording.

Demons, and those that use them, are the reason the Order of the Arrow was formed. They exist primarily as demon hunters, and are to thank for demons being an uncommon sight.

Demons can sense corruption in mortals, which is something caused by comitting murder, or debauchery and the like.

Demons can be killed, even the toughest ones. However death for a demon simply means being sent to The Void. And some demons are powerful enough to leave this void, making them quite a threat. The only demon known to be able to do that so far is the Chronodaemon.