Zelac-class Star Destroyer

The Zalec class star destroyer was a heavy command cruiser used for Battle of Jem7 to protect Tyber Zann's cruiser as he retreated from planet. The Cruiser, matched the Imperial-class Star Destroyer in weaponry and tech. Even almost matching it. The Zalec was able to hold its own against Darth Vader (Last of the Jedi)'s advanced Super Star Destroyer before being destroyed by a swarm of TIE Bomber's

Creation
Kuat Drive Yards created the Zalec as a prototpe for a command ship for the Imperial Navy, but was later dropped as Palpatine shifted his focus to Super star destroyers. The ship was later stolen by the Zann consortium.

the zann consotium
After the Consortium stole the Destroyer prototype, they retreated to the planet Jem 7 where they had a Base set up. The following months the Zalec was a mobile command bank.

Destrcution
When the Empire discovered the base, the ship was sent to battle the three awaiting Star destroyer's, but was later decimated when the Super star destroyers arrived