When we developed this level, we wanted to make something very dark, magical and mysterious. Hence we went for the dark purple lighting giving it a dark magical feel. If you go through the level, you will notice that we have made a lot of ruins through out the level which signifies the destruction done by the monsters and will give you an idea of the strength of these monsters you will be facing.
This forest used to be a village inhabited by humans. However, as the sun vanished, monsters started to rise and destroyed the village, leaving only ruins. Today, this forest is placed on a remote Island and hence the monsters seen on this Island are rare, stronger and smarter than an average monster.