Even in the legendary Weak Waters where a feather cannot float, as long as a Companion Spiritual Treasure evolves to a certain level, it can navigate freely within them.

The four directions of evolution also represent four different types of ships.

Without a doubt, choosing the direction of ’Bearing’ is like being a Gunner or Summoner in a game, who can head toward becoming a Heavy Artillery Destroyer or an aircraft carrier.

Choosing the ’Strengthening Base’ direction is like being a warrior in a game, which can develop toward a Cruiser or Destroyer.

Choosing the ’Wave-Breaking’ direction is like being an assassin or Archer in a game, with the option to develop toward a speedboat or airship.

Though the names speedboat and airship seem somewhat low-end, they not only precisely describe their developmental direction but also accurately reflect the characteristics of that direction.

As for ’Submersible Navigation,’ there is no need to say much; if ’Wave-Breaking’ represents the extreme attack speed of an assassin, then ’Submersible Navigation’ represents the most characteristic ability of an assassin: stealth.

After understanding these four developmental directions, Dong Tianyu immediately ruled out ’Bearing’ and ’Strengthening Base.’

The primary reason was that, even now, Dong Tianyu had not fully trusted this Companion Spiritual Treasure, perhaps because the way in which he acquired the treasure was too straightforward.

Or maybe it was because, with Dong Tianyu’s knowledge of Artifact Refining, there was absolutely no trust in a Companion Spiritual Treasure that could not be re-cultivated.

After all, be it the Standard Flying Sword that Dong Tianyu initially crafted casually or the Wave Rider obtained through the transformation of the Cave, both could be upgraded with additional materials and re-cultivated when Dong Tianyu’s Cultivation Level increased and better materials were available.

However, for the Companion Spiritual Treasure through the Mysterious Core, apart from allowing it to absorb Mysterious Cores for enhancement, there was simply no other method to improve it.

According to the theory Dong Tianyu learned, a Companion Spiritual Treasure should be just slightly less prioritized than a personal Spiritual Treasure, but he must also have full control over it.

Yet in reality, although Dong Tianyu seemed to be able to wield it as if it were an extension of his arm, he could not make any changes to it in actuality.

Devouring a Black Devil Core could only increase the body size of the Companion Spiritual Treasure.

Devouring a Blood-Colored Mysterious Core could only alter or enhance the material of the Companion Spiritual Treasure.

Devouring a Dark Green Trick Nucleus would allow the addition of a certain piece of equipment.

This was akin to leveling up and assigning skill points in a game; even though it seemed like there were choices to be made, one could only choose within the confines set by them.

Thus, facing this situation, Dong Tianyu did not fully acknowledge the Companion Spiritual Treasure as his own from the bottom of his heart.

However, although Dong Tianyu did not acknowledge the Companion Spiritual Treasure as entirely his own, he did not abandon it either; instead, he continued to provide it with a substantial amount of Mysterious Cores to facilitate its evolution.

Consequently, the Companion Spiritual Treasure’s status in Dong Tianyu’s mind was just that of a tool, without any emotional attachment.

As for tools, Dong Tianyu did not yearn for it to be mighty or omnipotent but simply to compensate for his deficiencies in certain areas.

Compared to airships which could be replaced with Sword Flight, what Dong Tianyu was lacking at the moment was the ability for underwater navigation; putting aside the fact that underwater creatures might initiate attacks now.

Even if there had been no such underwater creatures before, Dong Tianyu still had no means to stay underwater for an extended time.

That is why, although there appeared to be four different branches on the surface, there was only one real choice.

When Dong Tianyu internally decided to choose the ’Submersible Navigation’ direction, the originally egg-shaped exterior began to elongate and transform, immediately stretching from its pointed top and round bottom into an oblate-shaped shell.

Once the Companion Spiritual Treasure’s final form was set, Dong Tianyu summoned it from his Sea of Consciousness; at that moment, the Companion Spiritual Treasure had the appearance of a helicopter stripped of its rotor and the long stabilizing rod at the rear, leaving only the bare cockpit.

Dong Tianyu leaped from the deck of the Wave Rider, jumping directly towards the Companion Spiritual Treasure floating on the water’s surface.

When Zachary left the Wave Rider, he immediately took it into the Storage Space.

Even though he was very close to the Companion Spiritual Treasure, there was still no sign of it opening its warehouse to welcome him.

It was not until Zachary fell from the sky onto the Companion Spiritual Treasure that he noticed, despite its appearance resembling a solid piece of jade, it did not react when he leaped down. However, the moment Zachary touched the Companion Spiritual Treasure, he merged directly into its interior.

Although some basic knowledge related to it had emerged in his Sea of Consciousness after he made his choice, Zachary was still surprised when he merged with the exterior of the Companion Spiritual Treasure and entered its body.

Now that he was seated inside the Companion Spiritual Treasure, Zachary adjusted his sitting position and then began to submerge eagerly, wanting to see what the bottom of the water looked like at that time.

Under Zachary’s control, the Companion Spiritual Treasure immediately started to submerge. After being completely immersed in water, he noticed that for some reason, even though he had just begun the descent, when he looked up from the bottom of the sea everything was pitch black, and it was the same when looking down.

However, observing the surroundings, front, back, left, and right, he was not affected by anything even underwater.

Faced with this situation, although some guesses formed in Zachary’s mind, he did not dwell on them at that time.

Perhaps it was due to the recent evolution, the current submerging depth of the Companion Spiritual Treasure was only about twenty meters or so.

To put it bluntly, even a martial artist in the physical refining stage could easily dive to this depth now.

If the Companion Spiritual Treasure could only dive to this depth, then it would be worthless to Zachary.

Fortunately, Zachary could still feed it Mysterious Cores to rapidly enhance the Companion Spiritual Treasure.

Zachary then took out the unused Mysterious Cores from the Storage Space and poured them all out alongside the seat.

The Mysterious Cores, as if using the Earth Escape Skill, merged directly into the ground after falling.

But as the Mysterious Cores kept disappearing into the ground one after another, the Companion Spiritual Treasure began to transform quietly.

If the previous appearance of the Companion Spiritual Treasure resembled a helicopter with just a cockpit, then the Companion Spiritual Treasure was finally starting to change towards the appearance of a submarine.

When Zachary had poured out all his stock of Mysterious Cores, he noticed that the Companion Spiritual Treasure, which was initially single-seater, had expanded so much.

Inside the Companion Spiritual Treasure, there was not only a seat for a co-pilot but six seats for passengers had also been added.

Looking at the Companion Spiritual Treasure which was now starting to take shape, Zachary controlled it to continue descending further, wanting to test the current capabilities of the Companion Spiritual Treasure.

As the Companion Spiritual Treasure continued to descend, Zachary suddenly discovered something that gave him the creeps.

That was that the underwater world actually had strict stratification. Every twenty meters or so of descent was like entering another dimension.

Once inside this dimension, whether looking up or down, one could not see the events occurring in other dimensions.

It was at this moment that Zachary noticed that underwater there weren’t only creatures similar to sardines.

Other marine creatures all stayed firmly within their range of activity and would not leave this area to go up or down.

The deeper the exploration went, the larger the sizes of the fish encountered.

Watching those schools of fish approach the Companion Spiritual Treasure, some curiously encircled this sudden appearance of a big fellow, wanting to investigate what it was.

Zachary suddenly realized that his Companion Spiritual Treasure had reached the deepest point of its current phase, watching the approaching schools of fish around the Companion Spiritual Treasure.

Zachary suddenly discovered a problem—the original ’Disperse’ feature of the Companion Spiritual Treasure had disappeared, replaced by a trait of affinity with aquatic creatures.