Is a special potion, designed as a poison against spiders and rats by the Engineer, however, it didn't kill any of them, instead, they both gained a level and overpowered the engineer! After 3 years of lying in ruins, the potion was rediscovered and stupidly drunk by the adventurer, it didn't level him up, instead, he could think faster, move faster, and use less materials for when he crafted healing potions with the herbs in the wilderness! once, widely distributed, the potion's materials are now rare and costs much more than it did back in the day!
Will make a single crafter work faster.
Not too useful, but best used when materials, items, and a long wait, follow one item and is not suggested to buy, and can be earned in a Daily Bonus.