C203 Advancement of the Killing Spell!

Yeh Yulin struggled to close his eyes and began to channel the Killing Spell. Amidst the excruciating pain, he finally managed to center himself and concentrate on his cultivation.

This time, Yeh Yulin was determined to make a breakthrough with the Killing Spell first, aiming to elevate it to the 21st tier and officially turn it into an advanced technique