User blog comment:DirgeOfCerberus111/Adeptus Custodes Vs. Grey Knights/@comment-1932673-20111028201629/@comment-1932673-20111028204101

I mean that they specialise in fighting CHAOS, not just daemons, meaning that many of powers would not affect the non psychic custodes in the same way as daemons or chaos champions and spending all that time around the GT must count for something and would probally give them a resistance to psychic powers. Even if the GK were superior warriors they would still lose due to the number difference