You gain one of the following upgrades of your choice. Whenever you finish a Long Rest, you can replace the chosen option with another one. You can use this feature a number of times equal to your Masterwork Bonus. You regain one expended use when you finish a Short Rest and all expended uses when you finish a Long Rest.
Ballista Cannon
While piloting your apparatus, you can take a Magic action to fire the apparatus's integrated heavy ballista in a 120-foot-long, 5-foot-wide Line. Each creature in the Line makes a Dexterity saving throw (DC 8 plus your Intelligence modifier and Proficiency Bonus), taking 10d6 Force damage on a failed save, or half as much damage on a successful one.
Missile Pod
While piloting your apparatus, you can take a Magic action to launch a salvo of micro-missiles in a 30-foot Emanation originating from the apparatus. Each creature you choose within the Emanation takes Force damage equal to 5d6.
Rocket Engine
While piloting your apparatus, you can take a Bonus Action to light the apparatus's installed rocket engine. Until the end of your turn, the apparatus's Speed doubles, it has a Fly Speed equal to its Speed, and you can attack three times when you take the Attack action using the apparatus on your turn.