The Xth form is a form that goes beyond the system parameters in "The World R:2" given to Haseo by Zelkova to save him after "The Rebirth" was initiated and almost destroying Haseo's character and almost making him lose his soul to the game. Since Haseo is an Adept Rogue, each job extension gives him a new character class to use along with his previous classes, so the Xth Form is no different than having gone through a job extension, as it gave Haseo the ability to use Dual Guns from the Dual Gunner Class, enabling him to use the "double rengeki" technique.
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