Since I'm giving all umbral creatures a little bio page I had to do the second creature we see some justice. These little things play a large part in S1 Ep3.
"In a post-apocalyptic world where portals invite the supernatural, a mischievous high school student attempts to live a moderately normal life after becoming the first human-wulver hybrid. A werewolf."
If you're interested in reading it here ya go. ---> https://www.deviantart.com/littledevil-888/art/Wolf-Of-Penumbra-S1-Ep1-literature-802918761