The basement floor of the Ancient Cultivation Building.
The spell laboratory's door was locked tight.
Boom.
A soft explosion sounded.
Countless blindingly white streaks of Sword Qi scattered in every direction, too fast to see. They struck the laboratory walls with a rapid series of muffled thuds.
Ripples spread across the walls in layer after layer, barely holding them back.
This laboratory was meant for students and should have been designed to withstand Fifth Tier spell attacks. But spells had advanced rapidly over the years, and Chen Shu's Spirit Sea was far more capable overall than those of others at his tier. Once he reached the Fifth Tier, this testing range might struggle to contain him.
Chen Shu stood still, thinking.
As simulated Sword Qi produced by a spell, it already rivaled the real sword beams and blade arcs of ordinary Sword Cultivation and Martial Cultivation practitioners. There was a great deal of it, too. In terms of power alone, he was satisfied.
After days of revisions and Teacher Shi Qian's guidance, its effectiveness should now be no worse than the original spell encoded in the Swordlight Shell he held.
But a spell for a person to cast was different from one designed for grenades and artillery shells.
The Spirit Sea environment and casting conditions were different.
Grenades exploded after being thrown, and shells after being fired. Both released Sword Qi indiscriminately in every direction from their centers. They also had a mechanism that kept the Sword Qi from striking the ground below, directing it against personnel instead.
To turn that into a spell a Cultivator could learn, he had to make changes—
A Cultivator needed finer control over it.
First and foremost, it had to avoid hitting the caster.
Next, the caster had to control the direction in which