From Here to Eternity

When Harry and Hermione are attacked by Nagini in Godric's Hallow on Christmas Eve, they weren't quite so lucky. Hermione was bitten. However, the invisibility cloak, one of the Deathly Hallows, was in the path of the snake's fangs and venom. In an attempt to repair itself, time is shattered by the cloak and Hermione is greeted by familiar, ice blue eyes.