Either finding or knowing that Azazel has possessed their comrade, the other members who arrive attempt to stop them and undo or prevent damage.
[1] The core mechanic of Devour is the destruction of ten totems (whether goats, eggs, or rats).
[2] Threats to the player come in two forms - the primary demon of the specific map and swarms of lesser hostiles.
On The Town and The Slaughterhouse, dead players will be banished to a different dimension, and will have to fight off the lesser demons to survive.
It also includes medkits to resuscitate downed party members and batteries as an additional UV source.