Blue Feather

Obtained

 * NPC: Hampric (Grocer)
 * Field: Port Lux, Fort Ruina, Undead Ground, Forgotten Ruin

Used to craft

 * Basic Craft: Concentration Potion (Lv 1), Concentration Potion (Lv 2), Concentration Potion (Lv 3), Extract Potion (DEX)