Not as big as a Super Star Destroyer, but it seems designed to do planetary bombardments.
Star Wars is one of those few shows I like the bad guys ships (canon and fanon) more than those of the good guys. Examples:
Fleet
Imperial Executor class - Star Dreadnought - Command
- https://unusualsuspex.deviantart.com/art/Executor-class-Star-Dreadnought-ortho-1-New-521174615
Imperial Bellator class - Dreadnought
- http://fractalsponge.net/?p=155
Imperial Impellor class - Star Battle Cruiser - Carrier
- http://fractalsponge.net/?p=1096
Imperial Allegiance class - Battle Cruiser
- http://fractalsponge.net/?p=52
Imperial Imperator class - Star Destroyer
- http://fractalsponge.net/?p=166
Imperial Victory class - Destroyer
- http://fractalsponge.net/?p=2072
Imperial Acclamator II class - Star Cruiser
- http://www.moddb.com/mods/star-wars-rise-of-hope/images/acclamator-ii-class-assault-ship
Imperial Vindicator class - Cruiser
- http://fractalsponge.net/?p=877
Imperial Vigil class - Frigate - Electronic Warfare
- http://fractalsponge.net/?p=151
Imperial Customs class (Militarized) - Corvette
- http://fractalsponge.net/?p=719
Imperial Intersector class - Gun Ship
- http://fractalsponge.net/?p=329
Other
Imperial Cargo Shuttle class - Cargo/Transport Ship
- https://unusualsuspex.deviantart.com/art/Imperial-Heavy-Cargo-Shuttle-ortho-2-New-651054439
Imperial Contentor class - Replenishment Ship
- http://fractalsponge.net/?p=2080
Imperial Assault Vehicle/Infantry class - Troop Transport Ship
- http://fractalsponge.net/?p=1652
Imperial Troop class - Troop Transport
- https://roadwarriorz44.deviantart.com/art/Imperial-Troop-Transport-WIP-1-430838028
Imperial Shock Enforcer class - Walker (AT-SE)
- http://fractalsponge.net/wp/?p=162
Imperial HAVw-A6 Juggernaut class - LAAV
- http://fractalsponge.net/wp/?p=134
Imperial Tycon class - Battle Station
- http://www.xwaupgrade.com/phpBB3008/viewtopic.php?f=1&t=10631
Imperial Construction Module class - Yard
- http://starwars.wikia.com/wiki/Imperial_construction_module
At the fighter level... I prefer rebel ships.