The Plague Spike is the aptly-named mountain range separating the Devourer from Drefia. It is known by many names, including Mountain of Poison and Scorpions Rock.
All throughout the Plague Spike are poisonous creatures, Hyaenas and Nomads.
Just on the western side of the mountains is Drefia, the hide-out of a horde of undead and a cult of necromancers.