Transmigration of Demon swordsman in another world
A martial artist spent his whole life to perfect his skills and become the best. His desire was limitless but his body was not. Eventually he dies from failure of his new techinique by exploding into pieces along with his enemies and half of capital he living in.
But fate has another plan for his soul.
P.S: Demon swordsman is word used for swordsman spent his whole life perfecting his skills in battlefield.