For ordinary players, daily supplies and equipment repairs cost a lot of Doomsday Coins, and there are very few monsters that directly drop Doomsday Coins, and almost every player is in a situation where they can't make ends meet;

Although this situation has been alleviated after the level is higher, a fifteenth-level player like Ma Yu only has a few thousand Doomsday Coins in his pocket at most.

"Brother, can you make it up for me, I promise to ......" Ma Yu cried and said to Wang Qi and the others;

Wang Qi and a few people looked at Ma Yu who looked like he was about to cry, and couldn't help laughing, they couldn't see him so sassy;

"Okay, this time with Brother Song, several pieces of equipment have already been hung in the auction house, I estimate that everyone can at least get more than 30,000 doomsday coins, and I will ......make it up for you when the time comes" Wang Qi glanced at a few people beside him, saw that they all nodded slightly, and said to Ma Yu with a laugh;

"Thanks, brothers!" Ma Yu said with a grateful face, then turned to Song Jian and said, "Thank you, Brother Song!" ”

Song Jian smiled slightly and did not speak;

Such a level 20 gold equipment can't be sold at a high price if it is thrown in the auction house, mainly because the level of players is not high now, and there are few who have reached level 20, so there will be no competition;

But if Song Jian roared on the radio, or directly put it on the Spark shop in the City of Songs to sell, it would definitely sell for a sky-high price, at least 300,000 doomsday coins, as for what price it could be sold at in the end, Song Jian couldn't predict it;

"I've got this recipe." Song Jian raised the alchemy pharmaceutical formula in his hand and said to everyone with a smile;

"It should be, it should be." Several people hurriedly said;

Seeing the formula in his hand, Song Jian couldn't help but smile on his face;

"Alchemy Pharmaceutical Formula: Advanced Recovery Elixir. Effect: After use, you can comprehend and make advanced recovery potion; Requirements: Alchemy Pharmaceutical Technique Level 5; ”

"Advanced Recovery Elixir: Consumables, Effect: It can restore the user's qi and blood value by 800 points at one time; The interval between each use should not be less than 10 seconds; ”

"I've finally got a way to make a healing potion." Song Jian roared fiercely in his heart;

After learning the art of pharmacy, he didn't even know how to recover the potion until now, although Song Jian didn't say it, but it was as if there was a thorn in his heart.

The general effect potion is not of great value, there is the best in the battle, there is no and does not affect anything, but the healing potion can save lives, in this game, the effect of the healing potion is especially great;

However, in the system store, only primary healing potions are sold, and once used, you can instantly restore 100 qi and blood points, with an interval of 15 seconds;

For players who have just entered the game, it is enough to recover 100 points of qi and blood value at a time, but for Song Jian, who has already more than 1,700 points of qi and blood value, recovering 100 points of qi and blood value is a drop in the barrel;

After looking at the materials for making high-grade recovery potions, they were all second-order and third-order medicinal materials, which were not very precious, and Song Jian could even directly cultivate them in the territory;

Now Song Jian already has two pharmaceutical formulas that can improve the level of alchemy medicine;

"After I go back, I can upgrade my alchemy medicine technique again." Song Jian said secretly in his heart;

After a short rest, Song Jian and the others continued to walk forward, and in more than half an hour, they encountered two more groups of mutant demons, and after killing them, Wang Qi and the four of them actually raised a level at the same time, reaching level sixteen;

And as expected, two more keys were dropped, one gold and one black, and now Song Jian and the others have gathered enough five keys of different colors;

After two waves of monsters, Song Jian is one level away from being upgraded at this time, and he doesn't have much combat experience, and a few more waves of monsters can also be upgraded by one level;

Soon, the five of them came to the door of the underground vault, which was a hall of more than 100 square meters, and the entire wall opposite was the door of the vault.

"I've heard that the doors of the vault are several meters thick, and they are all of the hardest alloys, and they can't be blown open even with explosives...... Ma Yu looked at the metal wall in front of him, and couldn't help but exclaim;

"The defense is so tight, there must be a lot of gold in it, haha, get rich, get rich!" Tang Rong's eyes were about to turn into gold coins, and he looked greedy;

"Maybe there's a warehouse of banknotes?" Zhou Qing couldn't see Tang Rong's greedy appearance, and couldn't help but pour cold water;

"Impossible, this is the central bank of the whole city, and it is not a branch, how can it not store some gold? There may be other treasures out there! Tang Rong shook his head and said, "Hurry up and open it, so as not to have too many dreams at night." ”

"How do you open this, with Brother Song's master key, or our five keys?" Wang Qi showed a hesitant look on his face, took out five keys and said;

The attributes of these five keys are very vague, only saying that they open the door to the mysterious place, but they do not directly explain that they are the door to open the underground vault.

"Isn't there a keyhole, I'll go up and have a look first!" Song Jian stepped forward, inserted the master key, and twisted it slightly;

Click~

There was a sound of gears churning from inside the door of the vault, and a palm-sized wheel next to it began to spin automatically;

After turning half a circle, there will be a pause, and there will be a "click" inside the door, and then it will be reversed a few times, stopping at a certain number, as if there is an invisible big hand, moving it;

It took a full five minutes for the sound of the gears inside the gate clashing to finally stop;

With a "click", the door of the vault, which was almost half a wall, finally opened, and popped out more than three fingers long;

"It's open!" Wang Qi shouted in surprise, and everyone stepped forward together, grabbed the handle of the door of the vault, and pulled it outward;

When the door of the vault was opened, a multicolored light bloomed from the vault, and suddenly came into contact with such a dazzling light that everyone couldn't help but close their eyes.

After getting used to it for a while, everyone looked towards the vault, and Tang Rong shouted in disappointment: "How can this be!" ”

Wang Qi and the others walked into the vault quickly, looked around, and were disappointed to find that there was nothing of value in the entire vault, not to mention gold, not even a single banknote, empty, like a warehouse that had been emptied;

"This thing should have been emptied a long time ago, right?" Wang Qi said disappointedly;

"Looks like yes......" Zhou Qing also nodded in frustration and said;

"What's under this foot, and why does it glow?" Ma Yu pointed to a huge pattern blooming with colorful light under his feet, and couldn't help but say;

Song Jian looked towards the ground, only to see a huge five-pointed star array carved under his feet, and five colors of divine light bloomed from the array, illuminating the entire vault;

"It's ...... Magic Circle? Song Jian frowned and looked at it carefully;

……