A staunch Epistolary from the ranks of the Dark Angels, Tanis Barachiel was a Librarian who served in the ranks of Deathwing and was later transferred to 3rd Company, keeping a stern, vigilant gaze on almost everyone in the entire Chapter. His psychic abilities have saved the lives of his brothers numerous times, and despite the initial suspicion on psykers, is a respected member who had hard-earned the trust of said brothers.
Barachiel trained with the Chief Librarian Ezekiel when he was younger, and is one of the Chapter's senior-most Librarians. While not the best in the Chapter, his abilities are none the less a sight to behold. He has taken to using the power Hellfire, which casts great plumes of fire from his mouth and eyes. He is also a prodigial Diviner, capable of foreseeing battle tactics and sometimes accurately predicting the future, once he has focus.
Tanis Barachiel is universally regarded as hot-blooded and quite blunt, never too quick to state his mind on the situation at hand. However, he is none the less tactical and possessed a strategic mind. His ability to analyze a combat situation and solve it accordingly was definitely one of Tanis' greater strengths, as is his intelligence. He takes great personal pride in his abilities but does not openly preach it, as the Imperium is naturally suspicious of psykers, even sanctioned ones. His knowledge on the daemons of Chaos and the hordes of alien factions around the galaxy help his brothers out of the fire more often than not - when he is not causing said fire himself, that is.