This is a commission from for his Chapter the Praecepti Humanus
The Praecepti Humanus are the newly formed chapter of Space Marines founded by Phael, in rememberance of the Thousand Sons he used to belong to. Their numbers are only known by them, and perhaps those are close to them. The Chapter hails from Innovo, a planet formerly of mostly desert terraformed to be a virtual paradise.
Far more often rather than going by the full name they refer to themselves as simply Praecepti. Teachers.
As much as the information might suggest they put an emphasis on the mind, such destructive power is only used during wartime and to practice in order to ensure it's full use will not end in disaster. Wanton use of one's power, or conceit about one's knowledge and/or infallibility are severely frowned upon and likely to result in censure or worse. Arrogance concerning ones power is considered among the worst offenses one can commit.
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