This attack is a ranged attack. The sword would be used to strike the ground, which will cause the ground at the point of contact of the sword with the ground to explode in the desired direction.
The amount of damage done will depend mainly on the distance between the user & the opponent (the futher the opponent, the lesser damage this attack does) & also the amount of force used to strike the ground (more force=more power=more damage).
This attack style greatly resembles that of a dragon tunneling across the surface of the ground towards the enemy, hence its name.
Ryu-sou-sen, though not a range attack, is a devastating close-quarters attacking style, involving quick, random & multiple slashes at the opponent. Due to its random slash/cut, it is almost impossible to parry/block, making it one of the most devastating attacks in the Hiten Mitsurugiryuu.
Great for wearing down opponents with great stamina.....someone like Sanosuke....heehee (no offense, ok,Sano)
It's random attack nature resembles that of a Dragon guarding its nest from intruders.
My comments : One hell of a attack....whoa ! (don't get hit by this, or.......a mop have to be used to clean up your reamins...)