"The Ninth Style of the Tachi: 'Wheel of Flowers'."
Kasha can also be pronounced 'Hanaguruma', which is a kind of Chinese flower. It is a Clematis, which is a kind of 'climbing' flower (it grows in vines up available collumns, trees, etc). A Hanaguruma flower is seen during the animation of this weaponskill.
While Samurai may obtain a Great Katana skill level of 250 earlier than level 71, Tachi: Kasha can only be quested once base skill level 250 (without merits) and a job level 71 is reached (in order to wield the Tachi of Trials).
While Ninja can obtain a skill level of 250 or greater, Tachi: Kasha is solely available to Samurai at this time.
Great Katana skill level 250 is obtainable by the following jobs at these corresponding levels: