Assassin/Ninja Help Fire Defense Water Damage Build Please?

Hi im having trouble completing the fire section of the hive and was wondering if a better build would help. I only need to complete the last section and boss of fire. I usually kite, so i like high damage and low defense.

 

He's resistant to thunder and fire. Simply use a water weapon, or temporarily swap to a water build with high agility/defense. His attacks should be easy to dodge, but you should try and stay at a range anyways, so spam smoke bombs.

 

Any water weapon at all should do it, since he has quite a lot of water weakness. The simplest option is probably to just pick up Tsunasweep or Sitis.