Skin of Boomslang is an ingredient for potion-making.
Skin of Boomslang is used in the following potions
- Polyjuice Potion (Part 2)
- On the shelf in the back of Snape's Office in Book 2, Chapter 11, Moment 1 . You have to make a successful Swelling Solution before it and Horn of Bicorn show up.
- On the table in the back in Book 4, Chapter 35, Moment 1.