 His reign can be seen as the peak of the Kassite Dynasty's prominence and subsequently Kassite culture declined, exemplified by his successful military campaigns against Assyria and Elam, the glyptic style of cylinder seals, the literature inspired by him (Hemerology for Nazi-Maruttaš) and his appearance in the period piece Ludlul bēl nēmeqi, which was set during his reign.Nazi-Maruttaš faced a growing threat from the ascendancy of Assyria under Arik-den-ili and his successor Adad-Nīrāri I.The containment of Assyria was conducted through a strategy of flank attacks supported by his agents, eastern hillmen such as the Gutians, in a protracted war, avoiding a full frontal assault.