Enforcer One schematics.
Core Galaxy Systems Dreadnaughts were aimed at planetary assault and occupation and could operate in an atmosphere as well as land on a planetary surface. This type of vessel normally used its turbolasers to blast through planetary defense armadas, then enter a planet's upper atmosphere to allow its drop ships to deliver a planetary invasion force.
Enforcer One was a modified Dreadnaught, and the Rig appeared to be a highly modified vessel, serving as a space station thousands of years after the Old Sith Wars.