The principle was actually very simple. Take eggs and stones, for example. If an egg's strength and hardness increased tenfold, perhaps it could collide with a stone.
But.
If the stone's strength and hardness were likewise increased tenfold before the egg and stone collided, the egg enhanced tenfold would still be far inferior to the stone enhanced tenfold.
That was the logic.
Swish! Swish! Swish!!!
Next.
Xu Qing continued swinging his sword.
Another hour passed.
Soaring Dragon Sword LV9: 20700/15360 (Upgradeable!)
"Upgrade."
Xu Qing said.
Buzz!
The next moment.
The Omni-Codex flickered with fluorescent light.
At the same time.
A flash of white light passed over the Soaring Dragon Sword in Xu Qing's hand.
At that moment.
Xu Qing saw the scene of the Soaring Dragon Sword being forged. Within that scene, he saw a burly blacksmith whose features could not be made out.
This was a Blacksmith Grandmaster, one who had practically reached the ultimate limit of mortal forging arts. The material he used was the incomparably precious Thousand Year Cold Pond Profound Iron.
It could be said.
Such forging material was worth a fortune.
At the same time.
The flame he used was earth fire formed by drawing upon volcanic magma, while the quenching material was snow water formed from thousand-year accumulated snow melting atop the Heavenly Mountains.
Clang! Clang! Clang!!!
The forging began.
The Blacksmith Grandmaster poured in the painstaking effort of his entire life and exhausted all his mind and strength. After a full thirty-six years, he finally forged this sword successfully.
Roar!!!
Moreover.
On the day the sword was completed, when it left its sheath, its sword cry sounded like a dragon's roar.
Upgrade successful!
Soaring Dragon Sword LV10: 5340/30720 (This Peerless Divine Weapon was ultimately forged by a Blacksmith Grandmaster using Volcanic Magma Earth