Welcome to Harry Potter Answers. What would you like to know?

The Deer was actually a Doe. It was Severus Snape's Patronus leading Harry Potter to the Gryffindor Sword hidden at the bottom of the lake. Severus Snape's Patronus was a doe because all those years he had loved Lilly Potter nee Evan.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.