In the end it didn't work for me, I tried every step and the same old rivals kept appearing with the same level as always, as I had said I would surely have corrected it.Yes, the spell should be the second prize from the last (the last prize usually a Yellow Notebook), claim the spell first (in this case Avifors). After claiming it, open the Memory Book and activate another Duelling Event, let it sits while you're completing the 1st Duelling Event. After completing the 1st Duelling Event by then you can move to the 2nd Duelling Event you've activated.
Disclaimer: this worked for me more than a year ago, I don't know if this works now. Perhaps, JC has fixed this bug exploitation now, who knows.
See page one of the topicBien joué, donnez-moi mon téléchargement.
Figures. I don't have high hope for it in the first place. They might have patched this glitch long ago. I was lucky to have exploited it before it's gone.In the end it didn't work for me, I tried every step and the same old rivals kept appearing with the same level as always, as I had said I would surely have corrected it.
PD: bombard must be the spell with the highest unfair probability, you use it and it doesn't activate any effect, a rival uses it and it always leaves the effects on you (I know it can be like that with all spells but bombard is the worst for me)