After killing a Black Tide Monster, Gorsa returned to the Wizard Tower.
He had acted incredibly fast, taking only a few seconds from the moment he struck to the moment he finished off the Black Tide Monster. The gigantic Black Tide didn't engulf the First Wizard Tower until he had entered the tower.
Thor raised a hand, put the Mermaid's Tear into his mouth, and released the Nightmare Butterfly from the Diary.
As he watched the Black Tide about to swallow the Second Wizard Tower, he recalled the key points Mentor Gorsa had explained.
"First, kick the monster out of the Black Tide."
He abruptly raised his hand. The muscles throughout his body vanished in an instant, and he once again became a Black Skeleton draped in a black cloak.
The skeleton was just as agile. Like a cannonball, he shot forward, charging into the towering wave about to crash down on him just as his mentor had. He slammed straight into a Black Tide Monster hiding behind the wave and knocked it out.
Then the Black Tide engulfed the Wizard Tower.
Yet the tall, slender tower remained standing amid the colossal waves, just as it had through the centuries before.
At the same time, an actual cannonball fired from the Wizard Tower's artillery platform.
With an iron-gray casing, the shell relied entirely on physical force as it hurtled through the dense, damp air, dodged the monsters' contorted limbs, and struck the chest of the monster beneath Thor.
It exploded instantly, scattering fragments of its casing.
It was a hollow shell, and inside it was Keli's real weapon: a Black Tide Inertia Scroll.
The force of the explosion activated the scroll. Upon striking the monster's chest, it immediately unfurled, driving hundreds of steel needles into the creature's surface. Its chest