Fungi Hillock Side Quests

Mohkva Blood:

This quest begins with the Scared Mother from the Where is the Mother? quest:

Go Northwest to this location:

Find and kill 13 Mohkvas:

Each Mohkva will drop a vial of it's blood when it dies, any extras will appear in your inventory. They aren't good for anything, and even though it says "Press the right mouse button to use" it doesn't work. The game makes the drinking sound but the item doesn't disappear and nothing happens:

When you have 13 vials of Mohkva Blood bring them back to the Scared Mother for your reward: