The shadow demon in the Deadlands.
The Deadlands is a supernatural dimension featured in Season Three of Ash vs Evil Dead, depicted as a shadowy mirror version of Elk Grove, where entering certain buildings may transport others to separate buildings. Humans killed by evil, such as Deadites and the Kandarian Dagger, are sent here upon their deaths and preyed upon by a shadow monster. The Deadlands are also where The Dark Ones were initially banished.
Resurrection is possible for those who are sent to the deadlands, provided that they can escape. Kelly, Brandy and Ash were all killed and sent to the deadlands, after escaping the dimension, they returned to life.