Yazagh was a Drow monk of the Order of Orgolloyss. He held the rank of Monster and was hailed as the single most proficient user of Ki in all the Order. He was characterized as a spry man, looking seemingly immune to the ravages of old age, with an attitude as pleasant as an ear infection.
He was abrasive, rude, intolerant of everyone regardless of their rank, and was prone to using his great power on those weaker than him indiscriminately. His mastery of Ki was so that his skin alone was stronger than most rocks, and he could lift great loads with the force of his will. Yazagh could also read the emotions and surface thoughts of the undisciplined; his favorite method finding their greatest fear, which he claimed was easy to find based on the subjects defenses and standard emotional cocktail, then influencing the subject's mind into perceiving Yazagh as a manifestation of that fear.
He was one of the few people who contested Zilvudar for the position of Chief Monstrosity; Zilvudar winning out because while Yazagh could trick people into fearing him, Zilvudar was feared in and of himself. The fact that Yazagh had not achieved Enlightenment also aided in his defeat.
Yazagh was delegated to training the Terrors of Ezzebek by Zilvudar, either out of an attempt to suppress a political enemy or an attempt to better a colleague remains to be seen.