Jun Tianyun's <Rise of Storm> stance was already powerful to block the attack of Modar. However, it was only the setup for the next move, The Flashing Lightning.
The Grandsky Sword Technique might be a mortal technique. However, it's a sword technique nonetheless. For Jun Tianyun who finally got a real sword to use, this technique is much better than slashing his sword aimlessly.
However, Jun Tianyun was already satisfied with his magical sword and the sword technique. Jun Tianyun knew that he can use mana in his magic sword, making it sharper and more powerful.
Jun Tianyun also knew that Modar's experience in magic is greater than his. So, he had to finish Modar quickly before he could cast even more complicated spells.
*Hmph! Bastard! You think you can defeat me after getting a magic treasure?" Modar snorted as his hands glowed. His eyes rolled in pain as his face turned red. The blood burst from his hand as it turned into a blood colored sword.