Should be unlockable through an Ascension perk, should require slot 3 or greater. Titan Class is the same class FE's use. Should be buildable through a megastructure, unlocked with the perk, takes long time to build station and is of course, expensive. The ships would be very expensive as well, and would take extremely long to produce. They would have access to the same slot that the Defense Stations have, aka shield regen, hull regen, slower enemy shield regen, etc. just like Battleships used to have.
If possible they should be limited in number, even more so than a usual ship might be, perhaps requiring a limited resource (living metal or something comparably rare) to build, and as long as the ship is in use that unit of the resource would be used up. If the resource is used up the ship would have stats updated to be at like 99% inefficiency (aka useless, a very expensive paperweight).
This is to balance the overall power of the ship, perhaps it would be a super rare power substance needed to fuel the ship, or a similar reason. This would also allow for balance to be in place, if an empire begins the long process of producing the factory for the ships, you can counter this by declaring war and seizing the territories that contain said materials, to prevent the enemy from using them. It would create conflicts between people, and create highly contested areas that might not otherwise have even been noticed. Just my two cents.
If possible they should be limited in number, even more so than a usual ship might be, perhaps requiring a limited resource (living metal or something comparably rare) to build, and as long as the ship is in use that unit of the resource would be used up. If the resource is used up the ship would have stats updated to be at like 99% inefficiency (aka useless, a very expensive paperweight).
This is to balance the overall power of the ship, perhaps it would be a super rare power substance needed to fuel the ship, or a similar reason. This would also allow for balance to be in place, if an empire begins the long process of producing the factory for the ships, you can counter this by declaring war and seizing the territories that contain said materials, to prevent the enemy from using them. It would create conflicts between people, and create highly contested areas that might not otherwise have even been noticed. Just my two cents.