Professor Garlick's first assignment is super easy, all you need to do is to buy two items from a vendor and then use them on enemies.

Vendor

1. Talk with Beatrice Green in Dogweed and Deathcap shop right outside of the Hogsmeade village.

• Mushroom icon on top of the Hogsmeade in map.

2. Buy a Mandrake (500 Gold) and a Venomous Tentacula (600 Gold).

Use Items

1. Use the Venomous Tentacula wherever you want.

2. Find enemies in the open world and use the Mandrake when there is multiple enemies close to you.