Jammer Wizard

Many study at academies in the traditional arts of wizardry before ever setting foot on a spelljammer. You were the other way around: you learned wizardry solely to be a better crewmate aboard a spelljammer, dreaming of the life you would live amidst the stars. Now you're finally here, and you have a few specializations most wizards wouldn't think to consider before boarding these magnificent vessels.

Star Traveler

Beginning at 2nd level when you take this arcane tradition, you gain proficiency in Vehicles (Spelljammers) if you don't already have it. You use your Intelligence for ability checks with it. Additionally, any magical power you provide to spelljammers is doubled. For example, the spell boost spelljammer increases a spelljammer's speed by 20 feet by default for you.

Void Harnesser

Also beginning at 2nd level when you take this arcane tradition, you spend your action on your turn piloting a spelljammer or performing other spelljammer-specific tasks, you gain an additional action that can only be used on your turn to cast a spell with a casting time of one action.

Strings of the Void

At 6th level, you gain a fly speed of 30 feet. If you already have a fly speed, it is increased by 30 feet. If you don't already have a fly speed, your flight is magical and ends if you pass through an antimagic field (such as from the spell antimagic field) or if you have the spell dispel magic cast on you. You regain your lost fly speed when you finish a short or long rest.

Neutron Caster

At 10th level, your fly speed increases by 30 feet
Additionally, when you target a spelljammer with a spell of 1st level or higher or infuse it with magic using spell slots of 1st level or higher, you can choose for the spelljammer to regain hit points equal to your Intelligence modifier plus 1d6 per spell level expended.

Void Explorer

Starting at 14th level, you have an additional 1st, 2nd, 3rd, 4th, and 5th level spell slot. Track these spell slots separately; they can be expended only on spells you cast using your Void Harnesser feature.