Daemon Gates Series by Aaron Rosenberg

In a thrilling race against time, Empire archaeologist Alaric and his no-nonsense sidekick Dietrich must find and destroy four Chaos icons before their evil power can be awakened and used to summon a powerful daemon that will destroy the Empire.

After their adventures in Day of the Daemon, Alaric and Dietz head south to the Border Princes, the wild, lawless land south of the Empire. Narrowly escaping the clutches of a liche lord, their quest leads them to a citadel full of Chaos cultists. Against such impossible odds, how can our heroes and their new ally get in to defeat the daemon this time?

Alaric and Dietz have one last chance to track down the daemon and destroy it before it materialises and lays waste to the civilised world. This time, their journey takes them into the dark heart of the Grey Mountains, where they must face a savage horde of beastmen and their mutated ruler. Even with the help of their allies, the wood elves, how can our heroes ever hope to triumph against such impossible odds?