Harry Potter Wiki
Harry Potter Wiki

"Legend has it that Dai Ryusaki created a mind-enhancing potion that was super powerful... The potion was deemed dangerous, so Ryusaki was arrested and the potion destroyed! Rumour has it that, before he arrested, Ryusaki was able to hide a Dark Scroll with the potion ingredients. To this day, though, no one knows if the Dark Scroll actually exists... or what its contents may be!"
Corey Hayden regarding the "Legend of Dai Ryusaki and the Dark Scroll"[src]

Dai Ryusaki was a Japanese wizard that lived hundreds of years prior to the 20th century, and who was known to have held a teaching post at Mahoutokoro. At some point in his life, he became a Dark Wizard. Ryusaki's life was briefly covered in a book on the history of Mahoutokoro found in the Restricted Section of the Hogwarts Library.[1]


Dai Ryusaki was a professor at Mahoutokoro centuries ago.[1] At some point, he violated the Japanese wizard's code by indulging in "forbidden practises",[2] becoming a Dark Wizard.[1]

Legend had it that Dai Ryusaki created a mind-enhancing potion that highly powerful, but the potion was deemed dangerous and destroyed, with Ryusaki arrested. Rumour had it, was that before he was arrested, he was able to hide a Dark Scroll with the potion ingredients. Nobody after his death however knew if the scroll really existed, or what its contents could have been.[3]

He created a powerful weapon, but was stopped before it could be used. It is unknown what the weapon did or was created for, and the information died with his death.[1]

Magical abilities and skills

  • Dark Arts: Ryusaki was said to be a Dark Wizard, meaning he would have been proficient with Dark Magic. His weapon that he created was presumably of a dark nature.[1]
  • Potions: Legend had it that Ryusaki invented an incredibly powerful mind-enhancing potion that was destroyed due to it being dangerous.[3]



  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Harry Potter: Hogwarts Mystery, Year 7, Chapter 22 (The Search for Ryu)
  2. Writing by J. K. Rowling: "Mahoutokoro" at Wizarding World
  3. 3.0 3.1 Harry Potter: Hogwarts Mystery, Year 7, Chapter 23 (The Legend Of Dai Ryusaki And The Dark Scroll)
Potions (class)
Arsenius Jigger · Bilius Finbok · Blossom Degrasse · Dai Ryusaki · Damocles Belby · Erica Stainwright · Fleamont Potter · Gethsemane Prickle · Gilderoy Lockhart · Glossy · Glover Hipworth · Golpalott · Gregory the Smarmy · Gunhilda de Gorsemoor · Hector Dagworth-Granger · Hesper Starkey · J. Pippin · Laverne de Montmorency · Libatius Borage · Linfred of Stinchcombe · Mulpepper · Mundungus Fletcher · Nicolas Flamel · Phineas Bourne · Quintia McQuoid · Regulus Moonshine · Rogue alchemist · Rubens Winikus · Sacharissa Tugwood · Skower · Tilden Toots · Dr Ubbly · Vindictus Viridian · Zenith Xeep · Zygmunt Budge
Potions at Hogwarts
Cauldron cupboard · Dungeon Five · Potions basement · Potions Classroom · Potions Club · Potions Staircase · Potion Master's office · Potions Storeroom
Professors Bartholomew · Horace Slughorn · Severus Snape · Swoopstikes · Unnamed Professor (16th century) · Unnamed Professor (19th century) · Unnamed Professor (2021)
Textbooks A Collection of Above Three Hundred Receipts in Cookery, Physick, and Surgery · Advanced Potion-Making · Ingredient Encyclopedia · Magical Drafts and Potions · One Thousand Magical Herbs and Fungi
Potions studied at Hogwarts
Ageing Potion · Amortentia · Antidotes · Antidote to Common Poisons · Antidote to garish pink blended poison · Antidote to Uncommon Poisons · Antidote to Veritaserum · Befuddlement Draught · Calming Draught · Cheese-Based Potions · Confusing Concoction · Cough Potion · Cure for Boils · Deflating Draught · Doxycide · Draught of Living Death · Draught of Peace · Elixir to Induce Euphoria · Erumpent Potion · Essence of Insanity · Everlasting Elixirs · Felix Felicis · Fire Protection Potion · Forgetfulness Potion · The Famous French Method for the Bite of a Mad Dog · Garish pink blended poison · Garrotting Gas · Girding Potion · Hair-Raising Potion · Herbicide Potion · Hiccoughing Solution · Invigoration Draught · Laughing Potion · Memory Potion · Pepperup Potion · Polyjuice Potion · Pompion Potion · Potion for Dreamless Sleep · Rat Tonic · Regerminating Potion · Scintillation Solution · Shrinking Solution · Skele-Gro · Sleeping Draught · Strength Potion · Strengthening Solution · Swelling Solution · Undetectable Poisons · Veritaserum · Weedosoros · Wideye Potion · Wiggenweld Potion · Wit-Sharpening Potion · Wolfsbane Potion · Wound-Cleaning Potion