1-10

Frigate/Corvette: A small vessel not intended for the heaviest actions, but still capable at chasing down pirates and protecting convoys. For their tonnage they have good speed, range, sensors, and guns. Higher end versions might end up costing more than a line cruiser simply because of the miniaturization necessary. All of these feature combine to make them popular vessels across the Imperium especially near the frontiers.

11-20

Escort Frigate: These ships are intended to protect the flanks of larger ships and provide fire support. Their better guns and armor comes at the cost speed and range as they are designed to stay close to the battle fleet. Not exactly ideal for speedy work, but if the Inquisitor is accompanying a convoy or alternatively want to sneak in through silent running and keep a decently powerful combat ship for when the cover is blown it certainly won't disappoint.

21-30

Scouting Destroyer: Rare and specialized ships scout destroyers have reduced armament, and armor. This is to reduce weight and save space for the massively over charged engines and finely tuned sensor arrays. These engines both real-space and warp are tuned for performance and require an uncommon amount of attention lest they fail. As scouts they also mount powerful communications equipment, Astropathic hubs, and complex navigator housings. As all of these items are expensive and the ships are fairly fragile they are only given to experienced crews as the hand of a lesser master will see them hulked in short order, but a good crew will make these exemplars of electronic warfare invaluable to an Inquisitor.

31-40

Destroyer: Light and agile warships, destroyers are relatively inexpensive as they are large enough to not require specially miniaturized reactor and engine fittings, but not so large to require massive dock facilities. Most destroyers carry weapons, such as torpedoes, that hit well above their weight, though they can be a bit glass jawed. In Inquisitional hands, these ships can become even more intimidating as their torpedo tubes can carry a wide variety of munitions including a number of Exterminatus grade weapons, and their speed allows them to get into position very quickly.

41-50

Light Cruiser/Pocket Cruiser: Light cruisers are a mid point between a destroyer and a battle-line ship like a cruiser and are some of the smallest ships capable of independent action without specialized equipment. There are two primary branches of thinking with these vessels which in turn branch in to innumerable variants. Light cruisers are slimmer and faster, some being used as destroyer leaders mounting similar weapons. Others use said speed to chase down smaller ships before they can threaten the rest of the fleet. Other light cruisers, such as the Defender-class, are dedicated Escort Cruisers who serve as convoy flagships. Pocket Cruisers are similarly sized, slower but better armed and armored, some can even mount cruiser-grade shields. Both are considered the smallest warships capable of carrying a full Guard regiment without having to cram them in so much that their fighting capabilities are diminished when they reach the war zone without an acclimatization period. As proper warships an Inquisitor who commands such a vessel will indeed be a force to be reckoned with.

51-60

Cruiser: A full ship of the line, both well armed and armored, and capable of orbital bombardment as well as fleet actions. These ships, more-so than their smaller compatriots, are rare outside of dedicated militaries and only a fairly lucky or influential Inquisitor can acquire and maintain a vessel of this size. With the vast number of classes of cruiser in the Imperium as well as the vast amount of empty or underused space on a stock hull finding and modifying a cruiser to fit almost any requirement.

61-70

Strike Cruiser: Swift and well-armed for the tonnage theses ships are well optimized for planetary assaults. These cruiser carry heavy macro batteries and have powerful armor and shields, this allows them to support the troops and landing craft they carry. As expensive and specialized craft, these ships are all but unheard of in the Imperial Navy, but fairly common outside of it. Astartes-grade vessels are the highest grade of these ships as they are almost always superlative vessels built with well-trained crews and comprehensive supply lines in mind. The second most common users are the Adeptus Arbites when they are on investigation from the Adeptus Terra, usually over backed tithes. Unlike the Astartes vessels, many of these ships trade some void combat power for cost efficiency. As many Inquisitors find the vessels very suitable "stock", they are relatively common ships for Inquisitors on the move.

71-80

Battlecruiser: Up gunned and elongated Cruiser hulls, sometimes literally in the case of the Armageddon Class, Battlecruisers address the need for ships between cruisers and battleships as grand-cruisers have become increasingly rare. Though they did not receive much additional armor in the process making them somewhat fragile for their tonnage. An Inquisitor in command of such a vessel will have a ship ready for open war, though they find that the hulls have been optimized for void combat to a point that anything else is difficult. Also the well tuned systems and supply requirements aboard the ship can be a substantial drain on even an Inquisitor's influence. Alternatively, the Inquisitor may have a Heavy Cruiser instead. These vessels were deemed obsolete in Imperial doctrine, but civilian and reserve fleets still make use of their good balance of speed and firepower and they can still be produced.

81-85

Grand Cruiser/Battleship: Grand Cruisers are ancient vessels of the Imperial Navy for whom production in reasonable time frames has become impossible in all but the greatest Forge Worlds and Shipyards due to technological constraints, the Grand Cruisers are superior to Battlecruisers (as well as the old Heavy Cruisers, which have been deemed obsolete in Imperial Navy tactical doctrine and only found in civilian Chartist fleets or in reserve) in all but mobility within the specific models area of specialization and commensurately require more crew. Due to need, Battleships have been spared the reduction in production of Grand Cruisers, but are still not thrown around like candy as it takes time to build 8 to 10 km long behemoths of war. Finding one outside of a Sub-Sector/Sector/Segmentum Battlefleet, in Naval Reserve, the hands of a particularly powerful Rogue Trader dynasty (presumably one with great assets in the frontier, up to whole sub sectors) or as the flagship of an important official like Sector Lords is rare both due to cost and impracticality. An Inquisitor who has a Grand Cruiser or a Battleship is definitely on the more militant side of things, as one doesn't get these for speed, one gets these for battles and orbital bombardment.

86-89

Starfort: Most definitely not an exercise in subtlety if not hidden in a nebula or in the outer edges of a system, but a fleet-in-one is certainly capable of turning the tides of war for a more militant Inquisitor, or to make escape and infiltration near impossible as a mobile and warp-capable blacksite. Capable of housing an entire cities' worth of people, an Inquisitor, a cabal, or conclave of aligned Inquisitors and their friends in the sector government and the local Mechanicus, who can maintain such a crew will find themselves very capable of analyzing large amounts of data, having a large number of trained, if not exactly elite, force of naval infantry and dispensing large amounts of pain to enemy fleets.

90-100

Exotic: Alien (bear in mind some are unlikely, e.g. Eldar, whereas some are nigh-on impossible, e.g. Necron!), Mechanicus warship, Astartes vessel, etc.