The Firth of Spirits is the plane of the Afterlife where those who died horribly go as Lost Souls, completely devoid of their past and nothing more than a blank slate. This is also where the shamans of the Forest King go as their Spirit Animals.

The Firth is not devoid of dangers, however, as ravenous, wolf-like Devourers of Souls lurk among the foggy darkness.

Clearings are rare and provide refuge from the perils of the forest if and only if you manage to construct some sort of shelter in them.

A Titan is a type of Lost Soul who declined Faunus's offer and became a powerful, monstrous hunter who preys on Devourers of Souls. Faunus's horn was given to him by the First Titan.