Vasca Kavat is a Kavat companion carrying the infectious Vasca Virus. Vampiric in nature, its Draining Bite precept inflicts Slash while healing itself, and Transfusion sacrifices some of its health to revive its owner from Bleedout.
You need to finish Howl of the Kubrow to unlock the Incubator and install the Kavat Incubator Upgrade Segment, which comes from Tenno Lab research, Hyekka Master drops or the Market. You also need 10 Kavat Genetic Codes scanned from Feral Kavats on Deimos and a built Incubator Power Core. A top choice for survival-focused companions.
Vasca Kavat was added with Update 26.0 (October 2019).