Sorcerer

The Sorcerer breaks the pattern the other five classes follow. There is no second weapon to swap to: the staff is the whole kit, and the choice you make instead is which school of magic to commit to.

Elemental or Stardust

Elemental magic leans on status effects and sustained pressure, built around an elemental mark that makes a target take extra status effects from every further spell of that element. Stardust magic is the burst side, the one that deletes a Corroded boss or an overextended player.

Both are ranged and neither is durable, so the Sorcerer wants a frontline body between it and anything melee.