At least some content in this article is derived from information featured in: Harry Potter: Hogwarts Mystery & Harry Potter: Puzzles & Spells & Harry Potter: Magic Awakened.
They were the largest breed, weighing over a tonne, and also the most vicious. They were often bald beasts with thick, dark grey skin. They sometimes used Graphorns as mounts, though the Graphorns themselves eminently disliked this and many mountain trolls bore scars from trying to ride the creatures.
Though possessing enough rudimentary intelligence to craft primitive tools and clothing, mountain trolls were exceptionally thick even by troll standards; on the night one got into Hogwarts, the general consensus was that it must have been deliberately let in rather than finding its own way in, implying they were too stupid as to even work out how to open doors.
A band of mountain trolls were wreaking havoc in Liechtenstein, which led to Pierre Bonaccord's position as Supreme Mugwump of the International Confederation of Wizards being challenged by the local wizarding community, as he tried to ban troll-hunting and grant them rights at the time.
In the 1989–1990 school year, Jae Kim and Torvus decided to trade with each other. Jae wanted a mountain troll's vest for a strange collector in Knockturn Alley, while Torvus wanted some herbs from the Hogwarts greenhouses.
A male mountain troll was used as a diversion so that Professor Quirinus Quirrell could attempt to get past Fluffy to capture the Philosopher's Stone for his master, Lord Voldemort. The troll discovered and attacked Hermione Granger in a first-floor girl's bathroom, wrecking the place and nearly killing the girl as well as Harry Potter before Ron Weasley used the Levitation Charm to strike it in the head with its own club, knocking it out. What happened to it afterwards is unknown.
A second troll was supplied by Quirrell as one of the seven defences for the Philosopher's Stone in the Underground Chambers. Described as being much larger than the first one, it was nonetheless easily knocked out by Quirrell as he made his way through the obstacles.
Known mountain trolls
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Philosopher's Stone (film)
- Harry Potter and the Philosopher's Stone (video game)
- Harry Potter and the Prisoner of Azkaban (video game) (Appears on a Famous Wizard Card)
- Harry Potter and the Order of the Phoenix (video game) (Exploding Snap Famous Wizards Card)
- Harry Potter and the Half-Blood Prince (video game) (Mentioned only)
- Harry Potter and the Deathly Hallows: Part 2 (video game) (Appears in Memory)
- Harry Potter and the Cursed Child (Mentioned only)
- Harry Potter and the Cursed Child (play) (Mentioned only)
- Fantastic Beasts and Where to Find Them
- LEGO Harry Potter: Building the Magical World
- LEGO Harry Potter: Years 1-4
- LEGO Harry Potter
- Harry Potter Trading Card Game
- Wizarding World
- Harry Potter for Kinect
- Harry Potter: The Creature Vault
- Fantastic Beasts: Cases from the Wizarding World
- Harry Potter: Hogwarts Mystery
- Harry Potter: Wizards Unite
- Harry Potter: Puzzles & Spells
- Harry Potter: Magic Awakened
Notes and references
- Illustration of Diagon Alley by Jim Kay from the Deluxe Illustrated Slipcase Edition of Harry Potter and the Philosopher's Stone (see here).
- Fantastic Beasts and Where to Find Them
- Harry Potter and the Philosopher's Stone, Chapter 10 (Hallowe'en)
- Harry Potter and the Order of the Phoenix, Chapter 31 (O.W.L.s)
- Harry Potter and the Philosopher's Stone, Chapter 17 (The Man with Two Faces)
- Harry Potter and the Philosopher's Stone, Chapter 16 (Through the Trapdoor)
- Harry Potter and the Cursed Child, Act One, Scene Five
|Magical creatures by classification|
|X||Flobberworm · Horklump|
|XX||Augurey · Bowtruckle · Chizpurfle · Clabbert · Diricawl · Fairy · Ghoul · Gnome · Grindylow · Imp · Jobberknoll · Mooncalf · Porlock · Puffskein · Ramora · Winged horse|
|XXX||Ashwinder · Billywig · Bundimun · Crup · Doxy · Dugbog · Fire crab · Fwooper · Glumbumble · Hippocampus · Hippogriff · Hodag · Jarvey · Knarl · Kneazle · Leprechaun · Lobalug · Mackled Malaclaw · Moke · Murtlap · Niffler · Nogtail · Pixie · Plimpy · Pogrebin · Red Cap · Salamander · Sea serpent · Shrake · Streeler · Winged horse|
|XXXX||Centaur · Demiguise · Erkling · Erumpent · Golden Snidget · Graphorn · Griffin · Hidebehind · Kappa · Kelpie · Merpeople · Occamy · Phoenix · Re'em · Runespoor · Snallygaster · Sphinx · Tebo · Thestral · Thunderbird · Troll · Unicorn · Winged horse · Yeti|
|XXXXX||Acromantula · Basilisk · Chimaera · Dragon · Horned Serpent · Lethifold · Manticore · Nundu · Quintaped · Wampus cat · Werewolf|