You have gone the through intense Physical and Sword training to become proficient with Roronoa Zoro's Three Sword Style.
Your current Mastery is at the same Level of skill and strength Zoro obtained after Training with Mihawk (post-Timeskip). This power also comes with a prodigious skill with swordplay allowing you to quickly reach the greater heights Zorro achieves later in the series
(Note: This power works well with any supernatural power that enhances your physique besides Haki.)