Chronicles of Khaldun: Crux of Eternity
Bezaldooz's Quasit Familiar
Bonatos is a quasit from the Abyss. Summoned by Bezaldooz when the wizard started studying demonology, Bonatos acts as his familiar. It is apparent, however, that Bonatos is not a particularly obedient familiar — when Bezaldooz let him go in Scandshar, he used the opportunity to leave and go beyond Bezaldooz’s control, only returning when it suited him.
Likewise, when Bezaldooz lost consciousness in Skyfall delve, he regained consciousness to find that Bonatos was trying to make a break for the exit.
Also, credit where credit is due. Image source:
Baxa, Tom. “Quasit” (2010). Monster Manual 3. Retrieved August 4, 2013, from http://www.baxaart.com/conceptthumbs.htm