Narcine class

The class is a type of cruiser used by the Xindi-Aquatic species from the 22nd century onwards. When the Xindi Council emerged from self-imposed exile in 2410 following the Undine attacks on Earth Spacedock and Qo'noS, the ship was reclassified as a dreadnought carrier. 

History
One Narcine-class starship allied with the United Earth Starfleet and Andorian Imperial Guard to stop the Xindi superweapon after it was commandeered by the Xindi-Reptilians, and carried the Enterprise into the fray. It was disabled by interference from a nearby sphere. Another carried the Enterprise back to Earth after the superweapon was eliminated. 

The Xindi largely went into self-imposed exile in the Delphic Expanse for over two centuries, but following a massive uptick in Undine activity in late 2409 and early 2410 they emerged and joined the war effort, sending Narcine- and ships into the battle against the Undine and the Iconians manipulating interstellar events from the shadows. 

Technical data
The Narcine-class was in the kilometer-plus size range, five times the size of a United Earth starship. ( [script notation])

It featured a large hangar bay in the primary section that could carry other ships within. In the early 25th century its complement included a quartet of frigates. 

The overall structure of the Narcine-class remained essentially unchanged from the 22nd century to the 25th but the class went through a number of refit cycles to keep it competitive with current designs. By 2410 the ship was armed with a cascade resonance catalyst device in addition to its conventional weapons, which was able to damage enemy vessels and weaken their defenses for further attacks. 

Interior design
Narcine-ships had at least one small room where oxygen-breathing humanoids could come aboard and communicate with the Aquatic crew. A round window was located between this room and the Aquatics' domain.