Hmm, since the Logrus is a major power, I don't know if magic itself would do the job. Perhaps if the magic was a geas that punished/tortured the user for trying to access the Logrus. Would such a spell fail to work in a hi-tech shadow? Perhaps the ritual is actually a contract with the Logrus to deny access. I'm actually trying to imagine a 'crime' dire enough that the Logrus would even care. I thing it would have to something that would threaten the survival/domain of all Chaos. But for that, death or chucking the offender into the Abyss seems to be the traditional means of punishment.