From Lexicanum

Ashok is a librarian in the Angels Sanguine who also served as a member of the Deathwatch. Like members of the Blood Angels and their second founding chapters, he suffers from the black rage. However, he had successfully managed to deal with its affects, although he has to combat the signs. He is the only Librarian to take on three Tyranid Zoanthropes and live.¹

Sources

• ¹:Warrior Brood (Novel)