C648 Strong Breakthrough
The reason why Dou Tian left the Swordless Cliff so quickly was not because Swordless Cliff were really useless to him. If he were to continue merging the sword moves at that place, he would definitely be able to increase the might of the Infinity Sword LIght.
Only, he already had a faint feeling that he was about to make a breakthrough. Four stages of sword force, Quadruple Wind