|"I show not your face but your heart's desire."|
Fumos Duo is the incantation for the most powerful version of the Smokescreen Spell. It can conjure multiple clouds of dark red smoke. This spell is quite useful in duelling, as the thick smoke hides 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)