The Xindi Reptilians use heavily armed scouts such as the Vark’Ha Scout Cruiser to keep watch over their territories – and those of their Xindi allies. Naturally distrustful of the other Xindi factions, the Reptilians feel it is their duty to oversee operations "for the greater good of the Xindi people."
The Vark'Ha is an acceptable ELINT platform with a 6 EW sensor rating. In combat, scouts such as this often provide tracking data to two escorting cruisers. This allows all three ships to act as one, striking with increased precision and deadliness.