The large combat cruiser of the 22nd-century Vulcan High Command, recognisable by its ring-shaped warp nacelle, seen throughout Star Trek: Enterprise and represented by the doomed Seleya.
The D'Kyr type has a long, tapered hull with a circular warp ring that stands upright in flight and folds flat when the ship is at rest. It is more powerful than Earth's NX class and a match for an Andorian battle cruiser. The type takes its name from the ship that picks up T'Pol's ancestors in Carbon Creek.
Named ships include the Tal'Kir in Future Tense and the Seleya, on which T'Pol once served. In Impulse the Seleya is found in the Delphic Expanse with its crew driven violent by trellium-D, and is destroyed. The cruisers also face the Andorians in Cease Fire, form the fleet V'Las sends against Andoria in Kir'Shara, and join the combined fleet hunting the Romulan drone in United. Mirror-universe Vulcan rebels fly them in In a Mirror, Darkly, Part II.