On 30 October, 2020, Delphini cast this spell on both Albus Potter and Scorpius Malfoy, to force them into time-travelling to 24 June, 1995, to make Cedric Diggory fail the Third Task of the Triwizard Tournament. Once they got there, an oblivious Cedric (convinced it was an obstacle that was part of the Task), disarmed Delphini and freed the two boys.
Fulgari is possibly derived from the Latin fulgur, "lightning", or fulgere, Latin for "to shine, lighten or flash". This corresponds to the luminous appearance of the spell's binding effect. Noting Rowling's love for puns, it is also possible that Fulgari is a pun on the English word "vulgar", which can mean "offensive" or "distasteful", especially since Fulgari has been used as an offensive spell.
Behind the scenes
- It is possible that it is the same or similar spell to the one that causes glowing gold chains to bind a defendant's arms to the Accusation chair when they are on trial for serious crimes.
- In Harry Potter and the Philosopher's Stone (PlayStation), Quirrel/Voldemort has the ability to magically encase Harry in luminous green cords, in reference to the scene where harry is tied up with ropes by Quirrel in the book. That may be this spell.