The Greatmother's Soulcatcher

Source
This item is given to the player upon acceptance of the quest Souls of the Decursed, which begins with Greatmother Taiga at Taunka'le Village in west Borean Tundra.

To complete the quest the soulcatcher must be used on ten Fizzcrank Mechagnomes which have been slain by the player or their party. The Mechagnomes can be found in the northern half of the Geyser Fields.