After The Anvils, Kate brought them to The Brews district. If The Anvils was a district that only sold equipment, The Brews was a district that only sold the Alchemist's products, potions, and antidotes. They could even buy poison, but they need a license to buy a potion. The empire controlled and watched the poison circulation within the empire.
For the first time, they found out that there were so many potions existed aside from Healing Potion, Mana Potion, and Stamina Potion. A Strength Potion as its name implied, the potion would increase their strength temporarily. What shocked them was the fact that this one potion had many variants.