These expansions rapidly added many new ships and concepts to the system which are parts of it to this day: The Hydrans, Andromedans and Lyrans were introduced as new empires that fielded novel technologies peculiar to themselves. All the races were issued a full complement of ship classes, particularly dreadnoughts, fleet tugs and scouts, which in the Designer Edition only the Federation and Klingons deployed. Notably, only the Klingon Empire built the superheavy 'Battleship' B10 class (in the Captain's Edition Module R5 the other races were presented with conjectural i.e. non-historical battleship designs). Heavy cruisers, the starship class the game was based on, were supplemented by 'wartime construction cruisers' (simply called 'war cruisers'), relatively inexpensive substitutes built on light cruiser hulls yet packing the firepower of their larger stablemates. All fleets deployed 'Command Cruisers' which were heavy cruisers with additional weapons and power, and some races deployed 'Leader' versions of smaller classes, such as destroyers or frigates. Carrier starships with attack shuttles (usually called fighters) became common throughout the Alpha Quadrant; in the Designer Edition the Attack Shuttle Carrier was unique to the Kzinti Hegemony. In the final years of the General War so-called 'Pseudo-Fighters' (later renamed 'fast patrol' ships; but retaining the 'PF' designation) were expendable 'attrition units' (like attack shuttles/fighters but larger with their own ship system displays) that operated from tenders, bases, or planets and hunted in flotillas of six. 'X-ships' or 'up-rated cruisers' featured altogether new technologies (like fast-loading torpedoes, overloaded phasers, oversize warp engines and high-capacity battery reserve power) based on the new versions of the "Enterprise" and Klingon battlecruisers seen in "".