Magic and Herbalism are closely related. Combining various herbs can achieve magical effects.
The Northland Bandits in the southeast of White Spring in Eternal Mountains Village can produce some special herb medicines. These medicines increase their power and allow them to devote their lives to villainy.
Please get some Bloodthirsty Butcher's Drugs from the Northland Butcher and some Chief's Iron Medicine from the Northland Robbers.
Give them to Captain Augusque. He'll know what to do.
Magic and potions are not intrinsically good or bad.
It all depends upon the user's purpose.
If we can understand the composition and recipe of their potions, perhaps we can use the potion for good and help the people of Ilya.