The value of a major monster core and an energy crystal were comparable. The former was dug out from the brain of a major monster and contained most of its elemental energy, while the latter was a mineral that only appeared in areas rich in elemental energy and was rarely produced.
For mages, the most common use of a Magical Beast's Crystal Core was to make the tip of a magic staff. It was also often used in some alchemy experiments. It had a supportive effect on both knights and mages, but the effect was very complete, and the advantage was that it lasted for a long time.
Energy crystals, on the other hand, were generally used to charge large magic tools or assist in breaking through to a higher realm. For example, energy crystals were the main source of energy for a floating ship or a void fortress docked outside the realm.
Locke had just become a high-rank Knecht and his impetus capacity hadn't reached its limit yet. Now that he needed energy crystals, why would he use such a method of exchange?
Most knights who came to the Sanctum to trade used major monster core as payment. The white-bearded Magister wasn't surprised and took the core from Locke.
He could tell the authenticity of the core with just a sweep of his mental power.
"Please wait a moment."
The white-bearded Magister got up and left for a while. Not long after, he reappeared at the window with four dark green scrolls in his hand.
"Here's your stuff, Herr." The Magister handed the scrolls over.
Locke didn't even look at them and kept the scrolls in his spatial ring. He didn't think that such a large exchange would cheat him.
"Are there any other items?" Asked the white-bearded Magister with a smile. His share of the transaction was six high-rank magic crystals.
"No, I'll come again if there's anything else." Locke got up and left. It wasn't that he didn't want to buy anything, but he didn't plan to buy anything here because it was too expensive.
"Alright then, Herr. Please remember my window number the next time you come. Have a good day!" said the white-bearded Magister with a smile as he pointed at the number 17 above his window.
"I will." Locke nodded.
After leaving the Sanctum, Locke wasn't in a hurry to find his next target. Instead, he found a restaurant and sat down for a meal.
That's right, a restaurant. There were many such shops in the trading area outside the Sanctum.
Casters and knights weren't the only ones on this island. There were also a certain number of ordinary people living here.
Some of them worked part-time as servants in the Sanctum Academy, while others opened shops in the trading area outside the Sanctum. Their main customers were Magicians and Knights.
This was the only way for them to make a living, because whether it was the giant forest inside the island or the endless sea outside the island, ordinary people like them could not get involved.
After the meal, Locke threw a low-rank major monster core on the table and said, "Keep the change!" He left as the waiter thanked him.
These ordinary people also had their own monetary system, but unfortunately, gold coins were not suitable here. Locke could only pay with major monster cores.
There was still half a day left. Locke strolled around the trading area leisurely.
He wanted to buy another spatial ring. The one he was currently using was given to him by Angelina in the past. As his strength increased and his wealth increased, the space inside the spatial ring was no longer enough.
Moreover, it was a female ring, so it was rather awkward for him to be seen when he took it out.
The trading hall he just left definitely sold spatial rings too, and they were definitely the masterpieces of a master in the Sanctum. However, he didn't want to waste his money there.
Locke didn't have too many requirements as long as the spatial ring was usable.
After walking around the trading area, he found what he wanted to buy.
There were all kinds of magic equipment placed in front of a stall. Many knights were gathered here, so there seemed to be a lot of good stuff.
The stall owner was a middle-aged male caster. He looked rather dull, like a nerd among casters.
These magic equipment were probably his creations. Although they looked a little rough, they seemed to be quite practical.
"How much does this gravity bracelet cost?" A dark-skinned, two-meter-tall man asked. He wasn't wearing a knight's armor, but with his muscles, he could probably block a normal sword attack.
"Five mid-rank crystal cores." The middle-aged caster was a man of few words and fell silent after stating the price.
"I'll take it!" The dark-skinned man threw the five mid-rank crystal cores on the stall and picked up the grey gravity bracelet.
He couldn't bear to put it down.
Locke had seen gravity bracelets in the training room of the Hall of Knights before. The small bracelet could be adjusted by the user to increase the wearer's weight by a hundred to five hundred kilograms. It was a good piece of equipment for training or sudden use in battle.
From the looks of it, this bracelet was far inferior to the ones from the Hall of Knights. It could also increase the wearer's weight by a little, only about four hundred kilograms.
But most importantly, it was really cheap. Locke couldn't help but complain. If he'd been in the trading hall just now, this gravity bracelet would've cost him a high-rank crystal core.
The dark-skinned man happily squeezed out of the crowd with his harvest.
"We can guarantee it if it's damaged!" The middle-aged caster seemed to have remembered something and stood up to shout at the dark-skinned man who'd squeezed out of the crowd.
No one answered him. Two black hands reached out from the back of the crowd and waved. The dark-skinned man nodded in acknowledgment.
Apart from the gravity bracelet, the middle-aged caster's stall had a lot of other good stuff. Some knights who'd picked out their items had already gone up to ask for the price.
"I need a spatial ring. Do you have any recommendations?" Locke asked the middle-aged caster when it was his turn.
"This one, this one and this one are all good." The middle-aged caster picked out three rings of different shapes and handed them to Locke.
Each ring was engraved with a mysterious mageweath and a faint surge of mana. Locke knew that these three rings had a larger internal space than the one he was using now.
"Can you tell me the difference?" Locke asked.
The middle-aged caster paused for a moment before taking the three spatial rings and explaining, "This one has an internal space of fifty cubic meters and can bear two tons of weight. This one has a space of a hundred cubic meters and can bear three tons of weight. This one has a space of a hundred cubic meters and can bear four tons of weight."
He'd made all three spatial rings, so the caster didn't hesitate to ask for them. The only difference between them was the internal space and weight capacity.
"I want this one!" Locke pointed at the spatial ring in the middle. It had a space of a hundred cubic meters. It wasn't comparable to Angelina's black pearl, but it wasn't too far off. It was enough for Locke's current use.