Quest exclusives
From Miners Settlement - Game Wiki
Certain items are quest exclusive items. These are typically used for a specific quest, and most are removed from a player's inventory during the quest. However, some quests have options to double the reward, so it is common to end up with extra quest items in your inventory under the "Currencies and Minerals" tab. They cannot be sold and are not used for anything after the specific quest. These items include Written Page, Blank Page, Truth Serum, Fire Feather, Tool Box and the City Seal.
Created by Drizzt