Remarkably increases ATK for ally units on the field.
Max upgrade bonus: All ally units' ATK +12%
Same as Normandy, Undercontrol is your starter 'ship.' You should upgrade it to 4/5/6 stars because it's cheaper to use it as your second team's ship over leveling up Coffin (the third ship you will receive for free).
Still, if you can clear content without any issues at 4 stars, you can leave the ship at this level.
- good at the start of the game to pass certain stages due to being Cruiser class.
- you will only use it for a few days, then it will gather dust.