|"I show not your face but your heart's desire."|
Fumos Duo was the incantation for the most powerful version of the Smokescreen Spell. It could conjure multiple clouds of dark red smoke. This spell was quite useful in duelling, as the thick smoke hid the target, making it difficult for an opponent to accurately aim their spells through the smoke.
- Harry Potter and the Chamber of Secrets (video game) (First appearance)
- Harry Potter and the Prisoner of Azkaban (video game)