Fart a la Carte is a pranking elixir that was mentioned when Fitz was telling Sophie secrets for a trust exercise. On page 251 of Everblaze, it was said that Fitz put some in Biana's breakfast right before her Level One Opening Ceremony, which gave Biana a bad case of smelly gas during her performance. It is most likely an elixir from Slurps and Burps.

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