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Slow-acting venom is, presumably, the venom of some creature or group of creatures that has an effect that works over a long period of time. This type of venom was briefly covered in Gilderoy Lockhart's Gadding with Ghouls. Hermione Granger used this fact to convince Lockhart to sign a note approving her to check out Moste Potente Potions from the Restricted Section of the library, as she claimed the book would help her learn more about the subject.