He untied the string and looked inside to see two transparent, colored stones inside. They looked like some kind of gem, but they were not very pretty.

「Mom, do you know what this is?」

『These are Magic Stones. You can collect them from monsters, and from this size and color, I think they’re from Goblins. If I remember correctly, they sell for ten Amid each.』

The Mana in monsters’ bodies crystallized in the moment they died, and the Magic Stones were apparently the result of that. They were used as ingredients in various magical items and spiritual medicines such as potions, or used as sources of power for even normal people with low Mana to use magical items.

If used as sources of power in this way, they became normal stones after the Mana they contained was depleted, so they were consumable items. But with alchemical refining, Mana could be imbued into the stones again, so they could be used over and over.

Nobody would bother refining the Magic Stones of Goblins and they would be used as disposable items, which was why their value was low.

『Incidentally, it’s more common for low-rank monsters to not even drop Magic Stones when they die. The probability for a Rank 1 monster to drop one is about one in a hundred. On the other hand, higher-rank monsters are almost certain to drop Magic Stones when they die. Rank 5 monsters and above will definitely drop them.』

Incidentally, Darcia had apparently thought it pointless to tell Vandalieu about Magic Stones earlier because he had been fighting nothing but a few Rank 1 Goblins at a time.