The aft view of a Vissian starship.
Vissian starships were advanced craft employed by the Vissians during the mid-22nd century.
The engine core of this class was constructed of over 200 elements, and had no need for magnetic confinement due to special fuel injection processes. It also emits omicron radiation during it's operation. Humans require innoculations to get in close proximity to an active engine core.
Much larger than than an Earth NX class starship, the ship could support family-style quarters and carried at least one stratopod for scientific operations.
This class was first encountered by Earth Starfleet in 2153, by the starship Enterprise (ENT: "Cogenitor")