[2] Shutruk-Nakhkhunte and his three sons, Kutir-Nakhkhunte II, Shilhak-In-Shushinak, and Khutelutush-In-Shushinak were capable of frequent military campaigns into Kassite Babylonia (which was also being ravaged by the empire of Assyria during this period), and at the same time were exhibiting vigorous construction activity—building and restoring luxurious temples in Susa and across their Empire.

"In 1158 BC, after much of Babylonia had been annexed by Ashur-Dan I of Assyria and Shutruk-Nakhkhunte, the Elamites defeated permanently the Kassites, a dynasty which had ruled Mesopotamia for four centuries.

[1][4] They killed the Kassite king of Babylon, Zababa-shuma-iddin, and replaced him with Shutruk-Nakhkhunte's eldest son, Kutir-Nakhkhunte, who held it no more than three years before being ejected by the native Akkadian speaking Babylonians.

He fled to Anshan, but later returned to Susa, and his brother Shilhana-Hamru-Lagamar may have succeeded him as last king of the Shutrukid dynasty.

Following Khutelutush-In-Shushinak, the power of the Elamite empire began to wane, for after the death of this ruler, Elam disappears into obscurity for more than three centuries.