The academy is in full swing preparing for battle, and Ciri is also rushing to make his main combat method--- [Fortress] new magic props.

[Imperial Time Acceleration Orb] and [Forbidden Stone] Before the next year's academy promotion battle begins, there will be no production of a few, and three of the [Forbidden Stone] will be handed over to Associate Professor Hobart as agreed. Ciri may not even be able to make her own two time-type magic items before the battle begins, and you may not even be able to count five fingers.

Therefore, although these two one-time magic items are powerful, they are destined to only be used as hole cards, not as conventional means of combat.

Only the [Fortress] is the first regular combat magic item exclusive to Ciri himself.

The main system of the [Logic Module] of the [Fortress] has been completed, and the rune engraving work is also progressing very rapidly thanks to the help of twenty more experimental assistants. But it's not enough to just get it done.

In Ciri's vision, the [Fortress] can independently and freely release the four basic natural element spells of [Earth] (also known as [Earth]) [Water] [Wind] and [Fire], and the conventional means of combat are composite elements formed by the combination of four elements in pairs, specifically:

[Water] + [Fire] = [Thunder]

[Water] + [Wind] = [Ice]

[Water] + [Earth] = [Wood]

[Fire] + [Wind] = [Searing]

[Fire] + [Earth] = [Fire]

[Wind] + [Earth] = [Sand]

These six series of compound elemental spells usually take a long time for mages to learn, but it is not difficult for [Fortress] to release them.

Generally, elemental mages major in one series of basic natural elements and minor in another series of basic natural elements, so as to achieve the purpose of using a series of composite elemental magic. Very few people will practice the third line, because it is very rare for the magic talent in the human body to have more than two basic natural elements, and even if they have the basic natural element talent of the whole system, only the two elemental talents have a high affinity, and the other two can almost be ignored.

For example, Associate Professor Bird, a geomage who helps Ciri process the Shadow Demon Stone. He himself majored in earth elements and minored in water, and was good at earth and water basic elemental magic and wood composite elemental magic. Earth-based magic has a strong defense, and water-based spells and wood-based composite magic have extremely strong recovery, so Bird's defense and recovery ability are among the best in the entire Flower Academy.

Earth-based magic is good at defense, and to study how to defend requires an understanding of offense. Associate Professor Bird has always been committed to the research of earth defense magic, so in addition to the basic elemental spells of the earth and water systems and the composite element spells of the wood system, he has also dabbled in the study of other types of spells.

However, having research does not mean that it can be used, in fact, relying on his own ability, an academic mage with the title of associate professor like Bird can only cast three kinds of spells: earth, water, and wood. Other elemental spells such as wind and fire, Bird, an associate professor, can force his first-level spells at most, and they are usually used to relieve boredom, but for enemies with the same strength as them, this is not as powerful as Bird's breath.

Multi-system compound spells composed of more than three elements are generally released by multiple trained mages, and they are extremely powerful. Or you can also rely on the rune circle to release magic props, such magic props are generally disposable products, the power is not small, the price is not low, generally used as the mage's hole cards, no one is willing to be extravagant enough to use it for regular battles.

After Ciri's [Fortress] is successfully crafted, it can freely unleash powerful multi-series compound magic. The [Fortress] made by Ciri, a spell that other mages use as hole cards, can basically be used as a regular means, so the true power of [Fortress] is self-evident.

In order to unleash the full power of the [Fortress], you must first scan enough elemental magic runes into it. It's okay to say that the low-level basic elemental magic is good, Ciri just asked the experimental assistant to go directly to the database to record it, and then transfer it to the database of [Fortress].

When the battlefield situation judgment system issues instructions as needed, it will use a small piece of shadow magic stone engraved with the basic elemental rune to form the corresponding circle, and then extract energy to infuse it, and this spell will be cast.

Compound spell rune arrays, especially multi-system compound spell rune arrays, require certain permissions to borrow and scan. Ciri's councillors have sufficient privileges to borrow, but his lab assistants don't. Even the council members can't arbitrarily change other people's library borrowing permissions, so the important multi-system multi-element magic rune circles in the back need to be scanned and entered into them by Xi Rui one by one.

Also, for all power-ups, the most important thing is the mana supply. Ciri himself naturally didn't have that much mana for the [Fortress] to use, and he needed to find a source of mana for the [Fortress] to have enough energy. The only condition that restricts the power of the fortress is the supply of mana.

Ciri has spent a long time searching for an energy mineral with the right ratio of energy storage to price in the Chamber of Commerce store, various auction houses, and the academy's database. Not only should this mineral be cost-effective, but the energy extraction rate should not be too low, otherwise it will also limit the power of the [Fortress].

In the end, Ciri chose a mineral energy stone called the Water Moon Stone as the source of the fortress's energy supply. The water moon stone is produced in the Praia plane where Ciri and Kayla traveled after their marriage, and is mostly located in their submarine veins. It has the word "water" in its name, but in fact it does not contain water-based magic, but a standard non-attribute energy that can be converted into various types of magic.

Water moon stone is relatively cost-effective, and the energy extraction speed is not low. The total amount of energy stored in the same volume of water moon stone is higher than that of other energy ores. Overall, the Water Moon Stone is very suitable for Ciri to use at this stage, so as not to bankrupt him.

After selecting the current stage of the [Fortress] energy ore, Xi Rui immediately purchased a large number of this water moon ore as an energy reserve for the future battle for the academy's promotion. After the matter of energy ore was completed, he began to work on the scanning of the final multi-series composite magic rune array, running to the database day by day to repeatedly find information, scanning, looking for information, and scanning again, this boring but indispensable work.

Ciri now only selects spells below level 6 that can be used in the high-level mage stage most of the time, because the spells at level 7 and level 8 above are too slow to cast at the current processing speed of [Fortress], which is not practical, and consumes a lot of energy each time, which is not suitable for regular combat use.

However, in order to cope with the unpredictable battlefield situation, Ciri also selected a few level 7 and level 8 powerful multi-system powerful compound spells as backups, and Ciri finally entered a level 9 ultimate archmage spell as his final hole card for a large-scale attack. This level 9 spell will take half a day to prepare, and it can only be used once at most, and it will consume most of Ciri's wealth, and he hopes that he will not use it in the end.