- " [Harry] thought his voice might soon vanish from lack of use. He bent a little lower over Advanced Potion-Making and continued to make notes on Everlasting Elixirs, occasionally pausing to decipher the prince's useful additions to Libatius Borage's text."
- —Harry tries desperately to ignore Hermione's ranting about Ron while doing his homework[src]
Everlasting Elixirs are a type of potion with the effect to either never run out of potion or to work forever.
Harry Potter studied Everlasting Elixirs in sixth-year Potions class, taking notes on them in the Hogwarts Library from his copy of Advanced Potion-Making, which the Half-Blood Prince had annotated.
- Harry Potter and the Half-Blood Prince (Mentioned only)
Notes and references