The Aegis of Entropy is a suit of armor powered from entropy that was designed by Darkseid.
He had it crafted from a fusion of Apokoliptian technology and an Imperiex probe.
Usage And The Problem Began
He offered it to Superman for use in the war against Imperiex. Superman refused to use it. Instead, John Henry Irons took and used the armor. As a result, he became increasingly dependent on it and came under the influence of Darkseid. Irons was summoned to Apokolips, where his niece Natasha, Superman, and others were able to free him from the armor. The process seriously injured Irons, which temporarily prevented him from using any armor.