Razorwing [Titania] revolves around her 4th ability: Razorwing. You go into pixie mode and you instantly get 70% damage reduction from [Aerodynamic] and [Aviator].

Her augment, [Razorwing Blitz], will increase your flight speed and your fire rate on your Dex Pixia, so you don't really need additional fire rate on them (thus ditching other arcanes and favoring Precision).

Arcane Energize will help keep your energy up pretty much all the time.