There are creatures I cannot identify in Deathly Hallows, when Harry is looking for Rowena Ravenclaw's Diadem.
I haven't been able to find the name of these creatures anywhere.
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The Cornish pixies make their second appearance in the Room of Requirement in Harry Potter and the Deathly Hallows – Part 2.
These are, of course, the same kind of pixies (possibly even the very same pixies given that Lockhart would have had no further need for them) that Harry valiantly fought against in Harry Potter and the Chamber of Secrets.