Viper-class Scout Sloop

Dimensions: 0.95 km long, 0.25 km abeam at fins approx. Mass: 4.9 megatons approx. Crew: 7,500 crew, approx. Accel: 6 gravities max sustainable acceleration.
The Viper is the smallest warp-capable vessel used in Battlefleet Calixis. The Viper is a fast scout ship, with immensely powerful realspace engines. It is used for short-term spy missions aimed at specific hostile regions: unlike, for example, a Dauntless light cruiser, which will conduct broad patrols over a wide area, the Viper charges into hostile territory at high speed. There it uses powerful auspex and augur scanners to collate as much information as possible, before retreating to a safe warp jump point while usually pursued by enemy ships.
Given its specialist role, the Viper is unsurprisingly limited in many ways. It is a tiny ship, with very restricted space for additional Components. Furthermore, it is not heavily armed, as extensive weapon batteries would draw vital power from the sensor arrays and engines.