In Forever Dark there is a mixture of Demons and other supernatural creatures that most are familiar with. We have the most popular shifters which consist of Wolves and Panthers that don't really need explaining. There's also the Undead or better known as Vampires and then there are Demi-Demons, Hellhounds, and Kitsunes.
I thought that I would give you a little insight into these lesser known creatures starting with the Demi-Demons.

Demi-Demons are rare immortal demon-human hybrids which are the result of unholy unions between two species. They appear quite human except for the brilliant crimson eyes. All have multiple fangs and lust for human flesh. They are extremely powerful and don't require sustenance to survive. They can easily devour a live human within minutes including the bones which allows them to call upon darker magic.

A Hellhound is a supernatural dog in folklore. They have glowing red eyes, super strength and speed along with ghostly or phantom characteristics. Hellhounds also have fire-based abilities and appearance. They undertake duties such as hunting souls and being protectors of the supernatural world and are also bringers of death.

The Kitsune can shapeshift and have magical powers. They can see and hear anything happening anywhere. They can possess a person, generate fire or lightning and manifest into dreams. They have the power of flight, invisibility and can create illusions. Kitsunes can have as many as nine tails which indicate their age and level of power. It is said that a Kitsunes soul is represented in the shape of a round white ball known as a Hoshi which can be found either in their mouth or carried on its tail and a Kitsune will die if separated from it for too long.