Although Hathaway has mastered the spell specialty of casting without materials, there are some spells that bring effects that cannot be achieved by casting without materials.

For example, the oils used in greasy surgery, Hathaway's carefully blended rose essential oil oil is much more effective than the effect of casting spells, not only is it extremely creamy, with an attractive floral fragrance, but also very moist.

Several boxes of this rose oil oil are consumed every day, and Chrissy also praises this rose oil.

During this time, Hathaway and Chrissy grew rapidly, and both of them learned a lot of spells, of course, Chrissy was not as good as Hathaway in this regard, after all, they were orthodox wizards. However, she also has her own strengths, such as the flexibility of the demon's body, and her otherworldly art of bondage, which Suren often indulges in.

......

After sweeping away the troll tribe, Zhenbei Fort returned to peace, and now he was thinking about how to subdue the drow elves next, when he remembered a knock on the door.

"Your Excellency, the caravan steward Jean asks for an audience. A servant said respectfully.

"Bring him here. Suren said after signing a document.

"Please wait. The servant bowed respectfully and took a few steps back before turning away. Soon Jean walked in with a man in his thirties, who was wearing a custom-made costume from Fort Zhenbei, who was not physically strong, and looked a little old, with a lot of calluses on his left hand and an empty sleeve on the other.

"Your Excellency, greetings from your servant Jean. The caravan steward Jean saluted respectfully.

"Okay Jean, don't be so polite. Su Lun pointed to the seat next to him and motioned for the two to sit down. After the two of them sat down, Su Lun asked, "Jean, do you have anything to report this time?"

"Your Excellency, this is Marshall, and this time he has something important to report to you. Jean pointed to the man next to him. "He's a slave I bought back from the city of Carthus. ”

Suren glanced at Marshall, then motioned for him to speak.

"Honor... Your Excellency, I am a prospector, and I have discovered a vein near your territory. Marshall was a little nervous at first, but soon became excited and his eyes brightened.

"Minerals?" Su Lun, who was looking through the papers, stopped, "What minerals?"

"Coal mines! I found a coal mine in your territory, and it's of decent quality. Marshall said excitedly.

"Where is the coal mine you found?" Su Lun immediately asked, a coal mine is very important to the territory, although charcoal can be used for iron smelting, but there is better coal, he will naturally not let go, and compared to charcoal, coal is cheaper and more versatile.

"I've estimated the approximate range, and the exact location needs to be further explored," Marshall said with a blushing face.

Listening to his story, Suren also knew the discovery of the coal mine, and had to admit that Marshall was a caring person, as a prospector, he was young and promising, experienced, and his monthly salary was also very good, but later an accident in the mine made him disabled, and after this accident, he was directly fired from the mine, and he was not even paid that month's salary.

Every day, he borrowed alcohol to kill his sorrows, and he became addicted to the vice of gambling, and the final result was that his wife divorced him, he became destitute, and he also owed a lot of debts to the casino, and finally he was unable to repay the money, and was sold as a slave by the casino.

After coming to Zhenbei Fort, under the persecution of survival, he had to go to work if he wanted to have enough to eat, and after hearing that he had the opportunity to regain his freedom and receive rewards such as land and housing, he immediately cheered him up.

In order to get rid of slavery as soon as possible and have his own house and land, Marshall began to use his best skills to earn points. During a small talk, he heard about the ogre's forged weapons, which brought him to the attention of a detail, the ogre's forged weapons were made of coal.

Since there was coal, there must have been coal mines nearby, and Marshall actually succeeded in determining the approximate location of the coal mine based on these few clues.

After getting the news of the coal mine, Su Lun was also surprised, and directly promised: "Marshall, if you are sure that the coal mine there is real, then I can pardon you as a slave, and reward you with housing and twenty acres of fertile land, and I will hire you to be the mineral consultant of Zhenbeibao." ”

"Thank you for your kindness, Your Excellency, I am willing to work for you and help you find the minerals underground. Marshall said excitedly.

Two days later, news came that they had found the mine, and the good news was that the mine was an open-pit mine, which minimized the difficulty of mining.

Marshall sent back samples from the mines, and Suren found that the mines were of average quality and were not suitable for forging weapons, and that they needed to be processed to make coke if they were to be used.

The method of making coal into coke is very similar to the method of making charcoal, and it is also isolated from air dry distillation, which is not difficult for Zhenbeibao, which already has a rich process of making medium carbon, and it is directly made after improvement according to the charcoal production process.

Then coke is used to make steel, coke can provide much more temperature than coal and charcoal, and it used to take days to melt ore in iron-making blast furnaces, but now with coke, the world is almost the same in a day.

In order to dig coal, Su Lun deliberately led the troops to the surrounding wilderness to capture kobolds, as one of the best miners in the wasteland, second only to the gray dwarves, these kobolds are the main force in mining, fortunately, the number of kobold tribes is still good, Su Lun easily caught more than two hundred kobold slaves.

The slaves were first given to trained instructors who were proficient in training, and then after a brief training, they were escorted to captives with the barbarian warriors.

Su Lun arrested three batches, about five or six hundred people, and all of them were sent to the coal mine for mining.

Originally, Suren was still a little worried about the heating of slaves and displaced people, after all, charcoal is expensive, and the output is limited, and the charcoal distributed to each family is not done, but now with coal, the demand for charcoal will be greatly reduced.

In addition to large pieces of coal, there are also a lot of cinders, which are just used to make honeycomb coal, and the furnace specially used to burn honeycomb coal is not difficult to make, Su Lun plans to make all of these directly, as for gas poisoning, it is good to install a ventilation pipe.