Lugworm

• Classification: Magical Creature, Potion Ingredient

A lugworm is a type of burrowing worm. In the wizarding world, it is known primarily as a source for Potion ingredients. Its specific magical appearance is not described in the original seven novels, but it is presumed to be similar to its real-world, non-magical counterpart, which is a large marine worm.

The primary known magical use of the lugworm is in the brewing of Potions. The creature itself or parts of it are harvested as an ingredient.

• The mucus of a lugworm is a known ingredient in the Shrinking Solution (Pottermore).
• It is also listed as a Potion ingredient in various wizarding world video games, such as Wonderbook: Book of Potions and Harry Potter: Hogwarts Mystery (video game).

Lugworms are not mentioned in the original Harry Potter novels by J.K. Rowling. Their role as a Potion ingredient is established entirely through supplementary materials and licensed media that expand upon the wizarding world's magical pharmacopoeia. They serve to add detail and richness to the practice of Potion-making beyond the core narrative.

The magical lugworm is based on a real-world creature, the Arenicola marina. All known information about its use in the wizarding world comes from sources created after the publication of the original book series. The Pottermore website (now Wizarding World) was one of the first sources to establish its use in a specific potion.