From Abyssal Invasion to Bursting Stars with a Single Sword
Chapter 578 - 364: Biological Remains Under the Blue Hole

After making sufficient preparations, Lu Heng led the conscription team and set out for the Wugu Blue Cave.

For convenience, he borrowed a ship from the Sea Demon Clan before departure.

High Priestess Sona lent the clan's largest model of the ship and sent a team of Sea Demon Warriors to accompany.

The ship sailed over seven hundred kilometers, gradually approaching the Wugu Blue Cave.

Lu Heng and Su Muyu first flew into the sky, circled around the Wugu Blue Cave, and looked down at this cave from above.

As described by Sarian, from above, the Wugu Blue Cave is a massive blue circular hole.

The outer circle of the hole is blue, and the color deepens toward the center, turning ink-black at the center.

The diameter of the Wugu Blue Cave exceeds ten kilometers, very large.

Moreover, there are many submarine caverns inside, crisscrossed with a very complex structure. Sourced directly from NovelFire.

After flying around, Lu Heng let Su Muyu release the Chongming Bird, entered the invisible state and flew into the cave for reconnaissance.

Then, the two returned to the ship, letting the Sea Demon Clan captain patrol the periphery of the Wugu Blue Cave.

Upon arrival, Lu Heng promised Sona not to let the ship and the Sea Demon Clan's crew take risks.

Therefore, the ship would patrol only in the sea area 30 kilometers away from the Wugu Blue Cave.

Even at this distance, encounters with Black Scale Demons were frequent.

Jiang Shaoran would use ocean perception ability to detect Black Scale Demons and arrange actions accordingly.

This visit to the Wugu Blue Cave had two purposes: the first was reconnaissance, the second was to expand the Abyss Battlefield's gains.

To expand the Abyss Battlefield gains, it was necessary to hunt demons as much as possible, to help all team members improve their source energy level.

Therefore, upon discovering Black Scale Demons and assessing the situation, Liu Haiyang would lead the team to dive into the seabed for hunts.

Since Lu Heng could only exert thirty percent of his combat power in the ocean, he wouldn't waste his efforts and would stay on the ship unless Liu Haiyang's team faced danger.

Besides expanding gains, Lu Heng had another purpose for exploring the Wugu Blue Cave.

There's an important piece of information in his memory, but it hasn't been found yet.

In the first conscription from the Sea Demon World during the previous life, a Fourth Transition Source Material once appeared.

The Sea Demon Clan's first conscription happened a year and a half after the Abyss Descent on Blue Star, making the timing of the Fourth Transition Source Material very rare.

After all, the world will's conscription rules evaluate superpower users' combat power and then teleport them to the corresponding danger-level world.

The resource level and danger level of the Abyss Battlefield are proportional; the higher the danger level, the more high-rank resources appear.

Fourth Transition Source Material is only likely to appear in a danger-level 7 world, and it's only a chance, not a guarantee.

Lu Heng was interested in this Fourth Transition Source Material but knew little about it, only that it appeared in this world, but he didn't know where it came from.

Such information from the Abyss World is highly valuable and cannot be made publicly available casually.

Moreover, this Fourth Transition Source Material is odd, not from the Ocean system.

Lu Heng previously searched for clues in the Black Iron Dwarf Kingdom but found nothing.

In the Sea Demon Clan's territory, there were also no signs of the Fourth Transition Source Material.

Lu Heng asked Sona for a map, hoping to see if there were other places in this world where such a material might exist.

After examining it, the most likely place seemed to be the Wugu Blue Cave, where Black Scale Demons resided.

However, the cave's internal structure is complex; blindly rushing in would be too dangerous.

Just as the team needed to expand battlefield gains, they could investigate the Wugu Blue Cave to see if there are any clues to the Fourth Transition Source Material.

Liu Haiyang led the team to hunt Black Scale Demons underwater, clearing the path with rich rewards.

Su Muyu sat by the ship's rail, closed her eyes to control the Chongming Bird and explore the cave.

After entering the water, the Chongming Bird's speed reduced significantly, unlike its ease in the sky.

With her eyes closed, she explored while saying, "There are many submarine caverns within the blue hole, some inhabited by Black Scale Demons..."

She didn't let the Chongming Bird approach the caverns with Black Scale Demons, as her task was to explore the cave while avoiding demon detection.

Lu Heng listened to her report and suggested, "Look toward the center of the blue hole."

"Alright."

Su Muyu nodded in agreement, controlling the Chongming Bird to slowly approach the central area of the blue hole.

About two kilometers from the center, she took a deep breath and said, "I see the Ocean Graveyard Sarian mentioned; within roughly two kilometers in the center of the Wugu Blue Cave, many skeletons of ocean creatures are floating."

"These skeletons rotate counterclockwise around the central point, slowly enough that they aren't noticeable without close observation."

"These ocean creatures' bones are all black, which explains why the color at the center of the Wugu Blue Cave is so dark; it's the base color formed by these skeletons."

From above, these animal skeletons floating in the sea water stack layer upon layer, forming a black base color.

Lu Heng slightly furrowed his brows hearing this situation.

Because it's indeed too odd.

A two-kilometer diameter Ocean Graveyard with countless skeletons rotating around the Wugu Blue Cave center, like planets rotating around Heng.