Antitheurge

Some spelljacks dabble in potions and chemicals to aid in their abilities.

Spellcasting Experience

Beginning when you select this archetype at 3rd level, you gain proficiency with Arcana and Religion skill checks.

Additionally you gain the ability to cast the spell detect magic a number of times equal to your Intelligence modifier (minimum 1) per day.

Spell Shield

Starting at 7th level, you begin to inure yourself to the spells of your foes. You gain advantage on saving throws against spells and spell attacks have disadvantage against you.

Spell Sunder

Starting at 10th level, once per round when striking a creature with a weapon for which you are proficient you may dispel a spell effect on the target as if using the spell dispel magic. The spell is considered to be cast using a slot equal to 1/2 your level (maximum 9th).

Reave Magic

Starting at 15th level, when striking a creature with a critical hit, the creature must make a Wisdom saving throw (DC 8 + your proficiency bonus + the higher of your Dexterity or Strength modifiers). On a failed save, all active beneficial spells on the target are dispelled.

Opportunistic Void

Starting at 18th level, once per short rest when hit by or affected by a spell, you may exude a temporary antimagic field and negate the spell. You must succeed at a saving throw using your highest saving throw bonus vs a DC of 10 + the spell’s level. If the save is successful, the spell is negated.