It took Cecilia only a short time to find a hidden mechanism.

The location of this mechanism is very clever, next to a walled bookshelf in the first floor of the main hall, and only those who have searched carefully and have some knowledge of magic can find it. It is obviously impossible for those barbarians like the Blackwater tribe to discover here, so Sean and the others can naturally come to a conclusion, that is, the underground area of this mage tower, I am afraid that the people of those tribes have never explored it.

When Cecilia activated the mechanism, there was a faint click in the center of the hall.

Immediately afterward, the stone slabs on the ground began to recess downward, revealing a stone staircase hidden underground. Countless fluorescents lit up from this dark underground one by one, the light was not strong and dazzling, but it was very bright, almost the entire underground was reflected at a glance, this scene made Sean feel a little like the underground world he had seen in the game.

"It's kind of like the Shadow City." Harding let out a soft sigh, obviously a little surprised by the sight in front of him.

The Shadow City is one of the three recognized neutral cities in the underworld, it does not belong to any race or power, these three neutral cities have their own rules and positions, and any other force, no matter how powerful the big man is, must abide by the rules set by its House in these three neutral cities. Of course, this is not absolute, after all, the underground world is a world that admires the strong very much, so if the strength is strong enough to defy the sky, these three neutral cities can also walk sideways.

But this kind of person. They are often referred to as "rule-breakers", and they are at odds with the "rule-makers" like darkness and light. The vast majority of rule-makers. I don't like these saboteurs, or even want to destroy them all.

"That's what the underworld feels like." Cecilia, as a native and well-to-do, has never been to the Underworld—in fact, even a dozen generations back in time for today's surface dwellers would not have had the opportunity to go to the Underworld.

"Almost." Harding spoke, "But it's a little different from the real underworld. …… Only big cities will have such beautiful fluorescence, and ordinary small places or wild places will not have such beautiful fluorescence. …… But I can't say the specifics, anyway, there is a difference in feeling. But the difference is not significant. ”

"Mainly because there are no buildings here." Sean pursed his lips, "Most of the cities in the underworld have a very strong ethnic style. Large cities like the Shadow City look more like a crude concoction, with the Underworld looking more crude and practical, and not as clean and tidy as it is here. ”

Harding pouted as well. But he didn't refute it. There was also no approval. Perhaps, Harding thinks that Sean's words are an insult to the underworld, and Harding, as a resident of the underworld, will naturally feel a little unhappy, but even if he wants to refute, he doesn't know where to refute. Obviously, Harding is not very good at drunken cannons, he is better at fighting.

The others looked at Harding. They all want to laugh but don't dare to laugh, after all, if they laugh. This is really a very rude act.

Everyone, began to walk down the stone stairs.

It wasn't a long journey, and soon everyone was in the underground area of the mage tower.

This area seems to be very large, almost the size of the entire island, but here there is a more detailed division of the area, including the important facility of the Mage Tower, the Magic Circle Center.

Generally speaking, the Mage Tower is the most important abode for a mage, and in addition to the relevant defensive measures, there will be some traps and the like to prevent certain people who are not popular with mages from visiting them. And traps, defensive measures, etc., like this, naturally need to consume a lot of mana, so there is also a control system such as the magic array center, and basically all the magicians inherited from the ashes era have the habit of establishing a magic array center in their own mage tower.

In order to maintain the mana consumption of the entire mage tower, the daily mana cost of the magic array center is naturally extremely large, so magicians generally have two choices, the first is to recruit a bunch of apprentices, and the most basic work every day is to inject a certain amount of magic power into the magic array; The other is to create a mana pool, which will automatically fill the magic circle.

Normally, no legendary mage would be willing to put a lot of effort into building their own half-plane, as it would be a waste of time. It's just that at this moment, the owner of the half-plane that Sean and the others entered is obviously not an ordinary legendary mage, so he not only spent a lot of time building his own half-plane, but even built a mage tower here, and it is no different from all the mage towers in the material world, and the supply method of the magic array is still a magic pool.

Yes, it's the magician's Origin Mana Pool.

It's just that at this moment, this magic pool has been completely depleted, and there is no liquid magic power here, and there are only a dozen magic crystals left that have condensed into crystals.

The so-called magic crystal is a kind of magic power that forms solids.

There are usually three ways for a mage to absorb mana, the first of which is to store the vaporized mana in zài's body.

The second is the liquid mana formed in the pool after the establishment of the mana pool, which can provide a very considerable amount of mana for the magician, allowing the magician to have a more durable combat ability. It's just that the establishment of the magic pool has very strict requirements, so it is usually only built in the mage tower or half-plane that belongs to the mage master itself, but because the former has certain limitations, once the mage who guides the construction of the mage tower is too far away from the range of his mage tower, then he will lose the sense of the magic pool, and naturally he will not be able to use the magic stored in the magic pool.

Only a mage who has his own half-plane can use and consume the mana pool mana in the half-plane anytime and anywhere.

As for the third type, it is solidified magic, that is, magic crystals.

Because the Mana Crystal is a very pure magical power, it can be used in many situations and as a precious material, and can even allow the mage to provide emergency mana replenishment in places where it is impossible to absorb it. Therefore, mana crystals are a kind of hard currency among powerful magicians, like these magic crystals with excellent color at the moment, each piece can be exchanged for a gold-grade magic equipment, and these dozen magic crystals can at least be exchanged for three or four pieces of legendary equipment, or provide Cecilia with the same number of times of mana full recovery.

But there is nothing left over from the elemental pool, which is of the same value as the mana pool, and everything seems to have turned into dust with the passage of time.

This is also unavoidable, after all, with the fall of this half-plane master, the mana pool and elemental pool that have been cut off from the supply of mana will inevitably be completely depleted. Even if it is even these dozen or so magic crystals, if there is no nourishment from the magic pool, I am afraid that after more than ten years, they will eventually turn into a pile of sand due to the continuous loss of magic power. This is actually the main reason why mana crystals can only circulate among powerful magicians, after all, magicians who don't have a mana pool can't preserve their inner magic even if they get it.

However, what really caught Sean's attention at this time was a bone fragment that emitted silver light in the middle of the magic pool.

The pool resembles a fountain, about one and a half meters high, with a two-foot-diameter disc in the center, a smaller disc around it, a smaller disc on the third level, and four large discs at the bottom. The entire mana pool is built on the mana center of this mage tower, which was originally opened when the door of the entire mage tower is closed, and then the mana in the mana pool will be drawn.

When a mage's mana is full, the disc in the middle of the mana pool will begin to pour liquid mana. When the first disc is filled, it flows to the second disc, then the third, then the fourth. And the condensation of mana crystals, that is, starting from the discs of the fourth layer, at this time, more than a dozen mana crystals are scattered in the four large discs at the bottom of the mana pool.

When Sean saw the silver-glowing bone fragment in the middle of the magic pool, he knew that it was the bone of the Holy Demon that he had been thinking about.

The bone fragment was only a finger long and almost two fingers wide, with a liquid silver glow flowing on its surface, and a black sheen around the edges of the fragment. This blend of silver and black does not make people feel anything strange, but on the contrary, it exudes an aura of holiness, which is very eye-catching. In fact, not only Sean, but also Cecilia, Harding, Heatley and Spector were immediately attracted by this silver bone fragment.

"This is the Holy Demon Skeleton?" Cecilia asked.

"Yes." Sean didn't need to take it to his hands to confirm it personally, he just nodded in affirmation.

After Cecilia and the others confirmed that there were no traps or dangers around, Sean walked straight to the edge of the magic pool, and then reached out and picked up the holy demon bone. Almost as soon as Sean picked up the Holy Demon Bone, a prompt sound from the system sounded in his ears. (To be continued......)