Blackhole stormtrooper

The Blackhole stormtroopers, or shadow stormtroopers, were specialized Imperial stormtroopers, under the command of Agent Blackhole. Their most distinguishing feature was their all-black armor—a stark contrast to the typical white armor common to other stormtroopers. This unique black armor provided some stealth benefits, which resulted from the stygian-triprismatic polymer material used in the production of the armor.
Shortly after the Battle of Yavin, Luke Skywalker and Leia Organa went on a mission to Vorzyd V, or the "Gambler's World", where they were supposed to disrupt the Imperial gambling operations with the support of the president of the world.
However, the operation was disrupted by Blackhole himself, and platoons of his stormtroopers were fighting the local resistance and the Alliance troops.
In 11 ABY, a squad of shadow stormtroopers formed a bodyguard for aspiring Dark Lord Carnor Jax during his attempt to take control of the Empire; it is believed that these were soldiers from Blackhole's old élite unit, but it is not known how they had come into service with Jax, or whether their attachment to him implies any contact with Blackhole. Although crack troops, they were slain by Kir Kanos on Yinchorr. The only noticeable difference between Jax's shadow stormtroopers and the original group were black viewplates on the helmet. The first Blackhole stormtroopers had white viewplates.'