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From Warhammer 40k - Lexicanum
→Daemonic Possession Therapy
==Daemonic Possession Therapy==
The most notable trait of the Marines of the Chapter is the process they undergo known as "Daemonic Possession Therapy". Each Marine is, under very tight security, subjected to possession by a minor denizen of the [[Warp]] in an area of their [[Fortress-Monastery]] known as the '''Hall of Tempering'''.{{Fn|13}} The creature is allowed to remain within the host body for twelve hours until they are cast out by a [[Ordo Malleus|Daemon Hunter]]. Some of the Marines are so damaged physically and psychologically that they have to be terminated. Most , however , survive , and need only minor reconstructive surgery.{{Fn|12}}
After a minor period of recuperation the subjects are taught the ways of combating [[Daemon]]s, trained in the use of the 666 verses of the [[Book of Exorcism]]s and equipped with the weapons of an Exorcist. To test their new creations, the Marines are put into combat on a [[Daemon World]] on the northern edge of the [[Eye of Terror]]. A squad of the [[Grey Knights]] are held in reserve, just in case they turned on their masters, while the Exorcist Space Marines achieve a kill ratio of 97:1. Most impressive, especially against Daemons. Test results show that their adrenaline production tripled and the levels of serotonin dropped drastically. This made the Marines much more aggressive and gave them increased combat effectiveness. Only 1% of the Marines fell to Daemonic infestation again, but the Imperial scientists believed they could eradicate the likelihood of this happening. On the basis that their souls are incorruptible and pure, they are effectively invisible to most warp daemons as their souls do not register for the leak of the mortal corruption. Only extremely powerful daemons are able to spot them.{{Fn|12}}
