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"Potter, I've never seen such pathetic work. Go fetch the jar of Fireflies from the adjoining room."
Severus Snape to Harry Potter[src]

This room connected the Potions Classroom to the Firefly Room, a potions ingredient storeroom. It was made of dark stone and the floor had two large, circular iron grates. It was draughty, dark, and damp like the rest of the dungeons, and had a large balcony overhead. It was located above the Troll Storeroom.[1]

History[]

In the 1991–1992 school year, Severus Snape sent Harry Potter into this room, so that he could fetch a jar of fireflies to improve his potion. A cloaked Quirinus Quirrell, however, emerged from the overhead balcony, and fired down a spell that made a hole in the floor, making Harry fall into the deeper dungeons below.[1]

Behind the scenes[]

Appearances[]

Notes and references[]

Below the ground floor of Hogwarts Castle
Classrooms
Alchemy Class · Defence Against the Dark Arts dungeon · Potion-Mixing Room · Potions Classroom
Common Rooms
Hufflepuff Basement · Hufflepuff Boys' Dormitory · Hufflepuff common room · Hufflepuff Girls' Dormitory · Slytherin Boys' Dormitory · Slytherin common room · Slytherin Dungeon · Slytherin Girls' Dormitory
Corridors
Boathouse passageway · Corridor of Secrets · Dungeon cave · Dungeon Corridor · Forgotten Cavern · Hidden Herbology Corridor · Hieroglyphic Hall · Kitchen corridor · Lost Tunnel · Lower Chambers Corridor North-East · Lower Chambers Portrait Corridor · Lower Chambers Corridor West · Poltergeist Passage · Porticus Circumscriptus · Porticus Periculum · Porticus Imago · Porticus Medius · Prowling Passage · Quidditch cave · Secret way to Slytherin Common Room · Slytherin Corridors · Undercover route to the Kitchens · Unexplored passage to Hogsmeade · Way to Courtyard · Way to the Forbidden Forest
Halls and rooms
Athenaeum · Bottom of the Well · Campaign Room · Cauldron Room · Chamber of Secrets · Conical Crypt · Dark Hall · Deathday Ballroom · Deathday Party Hall · Duelling Room · Dungeons · Dungeon Chamber · Dungeon Five · Dungeon foyer · Dungeon hall · Dungeon Pit · Dungeon Portrait Room · Forgotten Dungeons · Grate Chamber · Kitchens · Map Chamber · Potions Classroom adjoining room · Potions Classroom dungeons · Room of Doom · Room of Runes · Shop · Slug Pit · Slytherin Duelling Dungeon · Undercroft · Vestibule of Mischief · Werewolf Saga Tapestries room
Offices
Secret study beneath Greenhouse One · Severus Snape's office · Slytherin's Scriptorium
Other locations
Boathouse · Dungeons cell · House-Elf Living Quarters · Lever Rooms · Lower Hogwarts Castle · Keepers' Caverns · Troll Bedroom · Underground Chambers
Portraits, statues and other artwork
Basil Fronsac · Bearded man with book · Bloody Baron · Cecilia Gallerani · Charles Rookwood · Emily · Elizabeth Burke · Hooky · Horace Slughorn · Howard · Mad old man · Mopsus · Niamh Fitzgerald · Old man · Percival Pratt · Percival Rackham · San Bakar · Salazar Slytherin · Sleeping Dragon Statue · Sleeping hermit · Slytherin Dungeon tapestries · Urn of Ashes
Staircases
Detention Escape Route · Dungeon foyer exit · Dungeon Staircase · Grand Staircase · Slughorn's Staircase · Slughorn's Stairs · Staircase to the Quad
Storerooms
Basement · Firefly Room · Neville Longbottom's storeroom · Potions basement · Store Room · Troll Storeroom
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