Shadow AT-AT

The Shadow All Terrain Armored Transport was a specially modified AT-AT, painted black.

Characteristics
They were intended for use during night operations and on sunless planets. Despite the fact that AT-ATs were not designed to be used in stealth operations, the Shadow AT-AT was designed to appear suddenly out of the night to instill fear upon Rebel troops, although this was more of a psychological than a real practical reason, given the vehicle's size and weight.

Behind the scenes
The Shadow AT-AT was created as part of Hasbro's Titanium Series line of die-cast toy vehicles.

Notes and references
Varjo AT-AT