What if every legion has a one ship.The attack and defense ( cloak ,scan ,hull ,shield...)it will be a sum of all legion members atk and def. (only active) Example legion have 2 members.first have 1000 atk and 2000 def and second one have 500 and 600.The legion ship will have 1500 atk and 2600 def.And like the current battle tab it will be one more for fight between legion ships.This thing will be available for build but it will cost some resources from the base.(not sure how many)
Every legion member will share some energy for the ship like in legion base or the legion ship will use the energy from the base (that is already putted for upgrade)

Im not sure for what we are gonna fight for .Maybe badges or rewards for upgrading the base (hull deff and shield.) maybe some new kind of badges for special modules for the base.Im not sure so ill let u players to decide.

Im open for iimprovements.

neat idea, but maybe instead of one ship,a legion can create a building for the base that allows for the creation of ships, maybe for the defence of alerted planets or for the base itself, it costs X amount of cred/upkeep and takes up 1/5 slots for creatable ships in the building from the base you build. maybe you can order these ships in the defence of a planet, or your base, or another player being zeroed. order them to help take planets or help out with legion, tell them to take a shipment of arties, to another if you have a timer, it woudl all work

Well the second idea is the better one.

sounds good. perhaps legion members can insert energy into the ship and the amount of energy limits how many times the ship can attack.