Mind Scrubbing after the Heresy
So I finished Fear To Tread shortly after reading The Emperor's Gift that got me to thinking about Imperial techniques for dealing with Chaos taint. To my understanding, it's pretty much standard operating procedure in 40K for Space Marines and Grey Knights to get their minds scrubbed after dealing with a major chaos incursion. Granted, this doesn't seem to be the case for the Space Wolves after Armageddon, any of the Ragnar Blackmane books or possibly even The Battle of the Fang, but the space vikings seem to be extra immune to corruption and don't like the Inquisition, so what the hell.
In 30K, at only halfway through the HH, each loyalist chapter has been steeped in Chaos up to their eyeballs just to survive, with several going through chapter-defining changes... taking the Blood Angels for one, the Red Thirst/Black Rage bloomed into a chapter-wide malady that could take any member at any time, not just a one SM per campaign occurrence. Yes I know this was already present in every member of the chapter before FTT, but the events in the book specifically precepitate the Red Thirst/Black Rage into an ever-present just-behind-the-eyeballs issue for every BA all the time.
With the appreciation that the Grey Knights and Inquisition don't come into being until after the HH, do you think there are any consequences after the HH with the mass-exposure to Chaos received by the loyalist chapters? By the end of the Scouring, I imagine all of the loyalist Astares have had more exposure to Chaos than most GKs get in their entire 40K existence. If there weren't major issues with the exposure, then why the hell start the practice of mind-scrubbing the Astares?
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: Cigarettes in space?
: It's the final frontier, Nick.
: But wouldn't they blow up in an all oxygen environment?
: Probably. But it's an easy fix. One line of dialogue. 'Thank God we invented the... you know, whatever device.'