- Ron: "Know any spells?"
- Harry: "One, but it's not powerful enough for all of them."
- Ron: "Where's Hermione when you need her?"
- Harry: "Let's go! Arania Exumai"
- — Harry saving himself and Ron from the Acromantula[src]
Arania Exumai is the incantation of a spell used to blast away Acromantulas or other large spiders. If the spell misses and strikes stone, it will produce a large black scorch mark, and thus is not recommended for use on humans, although casting through or along a human produces no ill effect so long as a spider is struck.
When Tom Riddle had to frame Rubeus Hagrid for opening the Chamber of Secrets and tried to attack Aragog on 13 June, 1943, he used this spell against the Acromantula after forcing him to leave the box via Cistem Aperio.
Fifty years later, Riddle showed this memory to Harry Potter via his diary, and Harry would learn this spell for his own use against Aragog's colony of Acromantulas in the Forbidden Forest. He used it twice, first to blast away an Acromuntula in order to clear the path back into the Flying Ford Anglia, and second to save Ron Weasley from another Acromantula that got him by the neck.
Arania is derived from the Latin aranea, meaning “spider”. Exumai is possibly derived from exuo, Latin for “I lay aside” or "I refuse". Alternatively, the pronunciation of exumai is almost identical to that of exime, a conjugation of eximo, Latin for "I banish". Taken together, the incantation can mean "I lay aside the spider" or "I banish the spider".
Behind the scenes
- The spell was created for the film adaptation of Harry Potter and the Chamber of Secrets and does not appear in any of the novels.
- Tom Riddle's use of this spell released a simple white blast of light that missed Aragog, but left a scorch mark where the spell narrowly missed him.
- Harry Potter's use of this spell released a beam of blue-white light that kind of carried the Acromantula away before it was blasted out of sight.
- Also while Harry was successful at saving Ron from the Acromantula that had seized him, Ron was also caught by the light of the spell in the process, therefore it should have left a scorch mark on him.
- Bearing in mind viewers' concerns on the inaccuracy of subtitles for spells in the film adaptation of Harry Potter and the Chamber of Secrets (see also Vera Verto and Alarte Ascendare,) it is remotely possible that "Exumai" may also be incorrectly transcribed. "Exumai" is not a valid Latin word with relevant meaning, while the pronunciation by characters in the film can be alternatively transcribed as "Arania Exime." Exime, in contrast, is a conjugation of the Latin word eximo meaning "I banish," which is much more appropriate considering the spell's effect of repelling spiders.
- In Harry Potter and the Forbidden Journey, Hermione Granger uses this spell to fend the Acromantulas off from the riders. After Hermione casts Arania Exumai, it causes a bright flash. This is where the pictures are taken.
- Harry Potter and the Chamber of Secrets (film)
- Harry Potter and the Goblet of Fire (film) (Disc 2)
- Harry Potter and the Deathly Hallows: Part 2
- Harry Potter and the Forbidden Journey
- Harry Potter: Hogwarts Mystery (Fourth year)