The spell might be keeping you warm but with a lack of a source of light, do you really feel comforted?
The lack of light heightens the sounds that the tiniest of movements make. The sway of a branch, the breaking of a twig... all of these sounds grow tenfold the further you venture into the forest. The fog doesn't seem to help you either. These low-lying clouds can be seen casting odd shapes everywhere around you, making you question whether a shape is in its physical form in front of you or if it's a trick of your surroundings.
Tell me, do you trust your senses in the darkness?
Just when a sense of paranoia is threatening to sink in, you hear it.
"AAAAAARRGGHHHH!"
The sound of a scream punctures through the air, louder and clearer than any sound you've heard in this forest. Somewhere in the distance, someone really needs help.
Your help.
Dare you go further into the thick fog?