Abel released his mental power as he swam upward toward the underground river's ceiling. Even after reaching the highest point, his mental power still couldn't scan the ground.
This showed that the underground river was extremely far from the surface. Without being able to scan the ground, he couldn't use Teleportation to return to the surface.
His mental power swept through Valaya's Ring, and a cloak appeared on his body—the Cloak of Invisibility. He put on the hood, and the mysterious headband connected with his head.
In an instant, his mental power doubled. Everything within a full sixteen hundred meters was drawn into his mental perception.
He also discovered that the ground was more than thirteen hundred meters above him. This underground river was simply too deep. If he hadn't had the mysterious headband's help, he probably would have had to slowly search through the river for a relatively weak spot before he could return to the surface.
Yet in such a long underground river, searching bit by bit for weak spots would take a frightening amount of time. By then, the Lightning Faction and the Elf race would probably think something had happened to him.
He drew a Spell Pattern for Teleportation with his hand. Then his body vanished from the underground river in an instant, and he appeared on the surface amid a flash of white light.
Even though he could breathe underwater, he still couldn't help taking a deep breath of air before exhaling heavily.
"It's good to be alive!" Abel threw his head back and let out a Great Roar.
Even he found it hard to imagine that he had escaped from before a Legendary Knight capable of flying directly with his physical body.
The gap between him and that Legendary Knight was simply too great.