As a powerful psychic presence, anyone with [[psyker|psychic]] ability can feel it. Almost every attempt by a [[psyker]] to make contact with a Hive Mind, even by some of the most powerful, results in insanity or death, either because it would require an incredibly powerful psyker to withstand the Hive Mind's awesome psychic presence or because the nature of the Hive Mind is completely beyond the comprehension of human beings. This however can be argued, as Chief Librarian Tigurius of the Ultramarines seems to have some form of relationship with the Hive Mind, as he is able to make remarkable predictions about the Tyranids and their movements. Though this could be due to his uncanny gift of making predictions in general, but the accuracy and frequentness of his predictions about the great devourer seem to show he has indeed tapped into the Hive Mind, a feat thought possible only by a psyker of the Emperors degree.