Overseer Class 2 Star Destroyer

The overseer class ISD’s were class 2’s - modified to accommodate
Moffs/Grand Moffs as moveable seats of power. Like the Insidious, the Blackstar
(Sister ship to the Insidious) doubles as both a diplomatic and military vessel used to watch specifically Oversectors
under a Grand Moffs control. They were the brainchild of Grand Moff Pitchkins
who saw a gap in the empires field of view when it came to managing political
and military issues in a streamlined and unified way – that is to treat the two
as equals in terms of importance.
They come equipped with the latest in technological advances
that makes the ship almost impregnable by rebel boarding crews and it houses a
Naval Court and diplomatic centre to welcome and sort through planetary
governors and officials problems that may require a more military approach at
times. 
The Holonet transceiver is upgraded to send and receive easy
communications to seats of government as well as an emergency transmission
device that allows officials to send distress beacons. It has the latest in advanced
programs of the Planetary Scanner System (PSS) that automatically assesses a
planets economic stability in real time as well as COMPNOR and ISB statistics
on rates of potential uprisings and citizen happiness – But also holds
information on things like prison populations and conscripting targets. 
Overseers provide a more in depth analysis of governance
that can fed up to the Supreme Moff, which allows for keeping a better eye on
potential uprisings, rebel protests and terrorism in the designated oversector
of the localised Grand Moff and Moffs. The Insidious had great successes in
this role- proved by the reliability of taxes flowing into the mint increasing
by 14% and the population of planets within the oversector rating their
feelings of safety at 76% - an increase of over 23% from the previous 2 years. 
Overseers are already seen and feared by rebel sympathisers
and welcomed by governmental officials due to the ability to micro manage improvements
on behalf of the empires apparatus to the advantage of the Emperor.