Board Thread:Warhammer 40k General Discussion/@comment-24.177.35.35-20130905071358/@comment-28917471-20131026110300

Well, we are not sure if the people of the Interex were corrupted or not. Though any human can get corrupted eventually. The Interex weren't corrupted because they were not fighting the other xenos, they made peace upon them, and used diplomacy as their best choice of action.

The Grey Knightes are a diffirent case. First of all, the chapter's gene-seeds are that of the Emperor's himself. Second of all, the recruits must pass through all of the trials that will make sure they are protected from the daemons, like: mind-wipe,  implantation of the silver hexagrammic and pentagrammic Purity Wards that will defend them from possession, and of course... theiy have a deep faith in the Emperor...