Leeches are an ingredient used in potion making.
Leeches are used in the following potions:
- Apothecary : 8 for 6 Galleons
- Can be found on the bathroom floor in front of the third door from the left in Book 2, Chapter 9, Moment 2.
- Can be found in the water in the first layer in Book 3, Chapter 16, Moment 1.