Your Patronus would be a Raven!
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"Your patronus would take the form of a Raven. Ravens are commonly associated with the night. They are avid tricksters and are smart, witty, and cunning. Ravens also signify a change in consciousness. The sight of a Raven is usually considered a bad omen, but in some parts of the world it is a good premonition. They represent sins, especially thievery, gluttony and false teachings."