Oriani Class is the third line of Regina Marina ship tree after either Navigatori Class or Turbine Class.
Oriani Class is basically the upgraded and downgraded version of Turbine Class. It sacrifices 1 storage space on main gun displacements for extra total weight on the ship (so, you can add more armor). But, it gives you better weapons in this class than Turbine Class.
Class type: Destroyer (DD)
Requirement: RM Bridge Operator (Level 24)