Die Wächter der Dunkelheit (2005)

summary from the back of the book

The guardian of the dark

Part 3 of the "Sternenwächter-Kampagne" for the RPG based on the German pulp series Perry Rhodan.

The incidents that are described in Die Fährte der Eloxima did confrot the players first with the Galctic Guardians. Actually the Guardians, a galaxy-wide operating crime syndicate was declred as lost after the great "Hyperimpedanz-Schock". But the Guardians are still active -with work on a secrect project, of which the players had seen only a little.

This book contains a roleplaying adventure, which sets player characters of the levels 3 to 5 on the trail of long forgotten enemies of the Galacticans.