The Draught of Peace

The Draught of Peace was a potion used to relieve anxiety and agitation. Professor Snape set Harry and his fellow fifth-years this difficult potion as an introduction to potions commonly tested at Ordinary Wizarding Level. Despite not being the worst in class, Snape Vanished Harry's potion and gave him zero marks after Harry forgot to add syrup of hellebore. The potion was very complex to brew; the order and quantities of ingredients were crucial, as well as specific numbers of stirs in specific directions.