In Rod's memory, he was in the territory of Eri and arrived at a mahogany watchtower.

Rhodes recalls that the mahogany watchtowers at that time had extremely small interiors, with no decoration except for the spiraling staircase and the windows on the walls of the tower to let in light.

Even the area at the top of the watchtower only existed on a small platform for Rhodes to sit on and observe what was around him, but Rhodes experienced a fierce battle in this environment.

When at the top of the watchtower, Rhodes possessed a special skill, Eagle Eye, which can be greatly blessed in this special environment, which can be used to observe the surrounding terrain and other special creatures.

If Rhodes has special skills related to cartographers, such as wayfinding and logistics, he can even map the surrounding terrain at the top of a watchtower. This special map has a certain value, both for the interior of the freelance chamber of commerce and for conquest.

Before spells became so widespread that even the perspective of the earth was developed by mages, maps of certain areas drawn by experienced cartographers could be invaluable, far more strategic than anything else.

And when the mage kingdom Bracada became stronger, this began to change. Sorcery is also beginning to be used by mages for a variety of things, not just combat. Among these spells, the most special and at the same time the most strategically valuable spell belongs to the third-order perspective earth.

With the illusion of seeing through the earth, mages can easily get all the terrain in an area, as well as the special things that exist on the surface, from a bird's-eye perspective.

In the hands of legendary mages who specialize in this spell, seeing through the earth naturally has a more powerful effect, and all creatures on the surface of an area will be perceived by the legendary mage, and there is no way to hide it.

In this case, the value of the maps drawn by the cartographer, and the effect they can produce, are undoubtedly greatly diminished. Especially in some special cases, using the spell of seeing through the earth can get a lot of information in addition to the surrounding terrain.

No matter how detailed the map in the cartographer's hand is, it is not as fast as the perspective of the earth that the official mage casts, and the manpower and material resources spent to obtain a detailed map are also greatly reduced. The advent of the spell of seeing through the earth seriously hindered the development of cartographers.

In Rhodes's impression, there are not many truly famous mappers in the surface world, and even the few that remain also have mages as official ranks and have mastered the spell of seeing through the earth.

It can be said that the advent of the Perspective Earth spell has completely changed the rank of mappers. After the popularization of perspective on the earth, the draftsmen of the past either chose to change to other professions, or they had to change their previous drawing methods.

With this in mind, the cartographer had to abandon the vast terrain and focus on something else, such as the mines, the complex tunnels, or the layers of tunnels leading to the underworld.

It is precisely because of this that in Rhodes's impression, those truly famous mappers exist in the underground world where the sorcerers live, and among these mappers, there are also legendary ranks, and they have enough say in the entire underground world.

As a very strategic perspective land in the surface world, Rhodes has long mastered this spell, but Rhodes does not fully rely on the convenience brought by this spell, and when confirming the surrounding environment, Rhodes often uses the perspective of the earth in combination with the map.

In Rhodes's impression, in the territory of Dia, wherever the famous city of the dead is a little more famous, there will definitely be an extremely dense and impermeable black cloud in the sky, which is the dark canopy in the mouth of the necromancer.

The shroud of the dark sky brought an extremely eerie atmosphere to the City of the Dead, and the necromancers who existed in it naturally did not mind this, and even enjoyed this unique environment.

Even the city of death, where Rhodes is currently located, is shrouded in darkness. According to the information that Rhodes knew, the reason why the dark canopy was researched by necromancers, and was recognized by many necromancers in Diane, was not for this unique environment at first, but to resist the spell of seeing through the earth.

Under the shroud of the dark canopy, even the perspective atmosphere cast by the legendary mage could not penetrate the black clouds in the sky to get the real situation below the black clouds.

Relying on the unique effect of the Dark Canopy, no major area in the territory of Diya could get any useful information by relying on the spell of seeing through the earth.

This is especially true in the areas where the lich exists, and in those special areas, there are even more defenses than the Dark Canopy.

This effect of the dark canopy was naturally recognized by the other necromancers, and the main undead cities in the territory of Diya were all shrouded in black clouds.

As a dark canopy with such an effect, over the years, there have naturally been many necromancers who have tried to improve it in order to obtain more powerful effects.

In Rod's impression, a treasure he once obtained had such an effect, and he was able to create a black cloud very similar to the dark canopy according to his needs.

Compared with the dark canopy that exists in the city of the dead, Rhodes, who has this treasure, is naturally more convenient in the creation of black clouds, and can use the effect of this treasure at any time according to his own needs.

In the system's prompt for this treasure, it was also mentioned that it was the alchemy master's improvement of the dark canopy that allowed this special treasure to be obtained, but in front of the opponent that Rhodes is currently facing, this treasure is difficult to have any effect.

In Rod's impression, there may not be many things that can achieve the effect of a dark canopy and avoid the exploration of the earth.

The only thing Rhodes could confirm that it had this effect was the forbidden orb in Tanan's hand. As an independent artifact, the Forbidden Orb has a powerful effect that is enough to circumvent any detection spells, including the perspective of the earth.