Hehe. Myrmidons, people of the sword, true aspirants of the sword, seek to become one with the sword and eliminate their own sense of self. It is an aspiration to ascension. They live to ascend, most of them highly disciplined, thus they work in Aether, the divine element.
(Swordmaster upgrade is even called Kensei in Japanese. Means Sword Saint. In English, the class was Trueblade.)
Nitpicks: the class is called Swordmaster, not Swordsmaster. Assassin is also misspelt.