The Conquest mod aims to take a new approach to Nexus gamestyle, a more strategic one. Now you'll control whole fleets in a turn-based-environment while fighting your battles in real-time like you know and are used to, but the outcome of those battles will have an impact in a dynamical universe where you'll have to make critical choices and sacrifices.
From here you'll be able to choose which ship to summon from the rest of your fleets in system to assist you in the current battle. Upon arrival that ship will be transfered to the fighting fleet.