Prime your Potions is a music from the Plague of Shadows soundtrack. This is the introduction theme of the campaign, and a medley of other musics such as Flowers of Antimony and The Alchemist's Haven. It is Music Sheet #5 in Plague of Shadows. It can also be listened to in Sound Test after completing the campaign once.
Music Sheet #5 is unlocked by giving Percy 3 Scrap Sheets.
"Is scary song, but also adventure!"