Odachi, or Greatsword, is a medium range weapon designed for mid speed, powerful attacks. It's slower than Sword and less powerful than Axe. This weapon designed for those who likes to deliver some serious damage in quite save range, without any worry for being hit by opponent, a good weapons to fight mobs that is easy to lure. Some Oodachi skills however, are cancellable when attacked (such as Fierce Slash), and some even have a high risk due to its slow casting time (like Dust Storm Blast and Ougi Blistering Ice Wave) so you need to know the details of each skills that Oodachi has.