Kylstar's Vessel works as his headquarters and means of transportation.
The vessel is composed mostly, if not entirely, of crystals. The crystalline corridors are difficult to navigate and render X-ray vision useless. The top deck of the ship, from which Kylstar commands, is normally left exposed to space, however a ceiling can be grown and air generated to fill the vacuum if needed. The ship has at least sixteen weapons rooms. These rooms are used to hold captives in specialized containment cells, which provide breathable gas and nourishment. Each cell has an orb nearby which neutralizes the occupant by emitting a noise that inhibits their powers and renders them unable to concentrate. The orbs are customized to a specific occupant–and, for occupants capable of transformation, a specific form.
The heroes came to a window and discovered, to their dismay, that they were being held captive on the Moon.
The Moon December 1, 19:36UCT
The heroes had difficulty getting their bearings in the crystalline corridors. Captain Marvel came up with a plan to find the teleporters that brought them to the Moon, but the next moment the group was teleported inside a cell. They were addressed by Orb-One, providing translation for First Leader Kylstar, who told them they would remain where they were during their journey. Kylstar's ship then lifted off from the surface of the Moon and headed into space.
Superboy, Superman, Wonder Woman, Captain Atom and Captain Marvel remained imprisoned.
Kylstar's Vessel December 1, 22:31UTC
The captive heroes tried and failed to convince Kylstar to release them. They broke through the floor of their cell and attempted escape, but Kylstar had the crystals of the top deck grow to form a ceiling while others emitted breathable air. He then had the heroes teleported back to him. Kylstar then began to "reprogram" them, attacking Captain Atom, then Superboy.
Kylstar's Vessel December 1, 22:52UTC
Kylstar continued to dominate the heroes physically and was able to absorb and redirect Superman and Captain Atom's energy-based attacks. Superboy was able to throw Kylstar, but the First Leader landed on his feet with ease.