"スティールハーツ Steel Hearts is Nagisa’s signature sword.
Near the handle there is a trigger which sets off a carousel of photon bullets located at the handle end of the sword.
When you pull the trigger, the photon will shoot out like a jet at the bottom."
This is fanart from a game called 'Phantasy Star Online 2: Infinity'.
Program: Zbrush 4R6 P2
Time: Less than a day