At this moment, Luo Yan could not be there in person, so he had no way to use Divine Treasure to break through Yufu's illusions. However, he had rich combat experience and calmly used the Nether Fish's senses to determine Yufu's location.
The Nether Fish released a silent cry, spreading a ring of invisible sound waves.
The ring of sound waves rapidly spread through the surrounding waters, scanning everything it passed. Once the sound waves reached their limit, they began to flow back, eventually returning to the Nether Fish's body and being received by its auditory organs, forming an image in its mind.
Luo Yan also received this image, allowing him to determine Yufu's position. He did not dare delay and immediately had the Nether Fish use the Crimson Blood Killing Sword to sweep across a wide area toward Yufu's location.
Using illusions, Yufu concealed its form from the Nether Fish's vision, but it could not hide its body. Its mass and volume objectively existed, allowing the Nether Fish's sound waves to detect it.
However.
The Nether Fish's sonar positioning was not real-time.
It determined Yufu's location one second, but Yufu might have already moved the next.
Therefore, after determining its position, Luo Yan had the Nether Fish sweep the surrounding area with the Crimson Blood Killing Sword, using that location as the center.
That way, even if Yufu had already moved, it could still be injured.
For a time.
Crimson-red Water Tendrils churned and twisted throughout the waters, like more than a dozen crimson Jiaolong wreaking havoc in the sea.
They not only shredded Yufu's Heavy Water Cannonballs but also reduced the surrounding coral reefs to rubble, cutting countless merfolk into pieces.
When a scream from Yufu rang out beneath the sea, the illusion before Luo Yan's eyes vanished.