Snape uses his doe Patronus to show Dumbledore that he never fell out of love with Lily, his childhood best friend. Warner Bros.
A doe. And in his final battle with Lord Voldemort, Harry explained the significance of this to his adversary, and to us: 'Snape's Patronus was a doe,' said Harry, 'the same as my mother's, because he loved her for nearly all of his life, from the time when they were children'.
Severus Snape and the Deathly Hallows
He even sent his Patronus to guide Harry Potter to the sword of Gryffindor (a known Horcrux-killer) in a nearby lake.
He cast the Patronus Charm to show and illustrate to Dumbledore that Lily is the one he never stopped focusing on for all those years. Harry only existed to him as Lily's son and an extension of her.
If you can see/feel what your Patronus sees/feels when you send it off on a mission, Snape would know the moment the Patronus found Harry and would be able to hide the sword in the lake in time for Harry to find it when he arrived, minutes later.
Draco's refusal to reveal Harry's identity to Bellatrix was not because he liked him. It was because he believed that Harry was the only chance they had at defeating Voldemort. At first, Draco admired and revered Voldemort until he threatened his family's safety.
They were close friends, she saw in him someone special that she could care about. But she couldn't be with him. So, it seems like it was very unlikely that Lily ever found out Snape loved her.
1 Albatross
As the rarest Patronus in the Wizarding World possible, the Albatross represents an enormous bird that flies freely across any sea. This rare Patronus represents those who are simultaneously fearless, optimistic, happy-go-lucky, and ambitious.
Snape's love for Lily fed his hatred for James, and meant he would stop at nothing ' even arranging the murder of her child ' to possess Lily. Lily's life would be spared in return for Snape giving information of the prophesy to Lord Voldemort.
With Harry and Hermione despondent after the events in Godric's Hollow and Ron trying desperately to find his way back to them, it was Snape's Patronus – the Silver Doe that was somehow familiar to Harry, perhaps because it recalled his mother's own Patronus – that brought them back together.
As Rowling explained in a series of tweets, Snape loved Harry's mother, Lily, and his unrequited affection drove him to resent Harry's father, James — and by extension, Harry himself.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
So when Ron said three, it wasn't a mistake. He meant there were three more horcruxes to destroy before being able to destroy the fourth and final piece which was in fact Voldemort himself.
Snape was born to Eileen Prince, a witch, and Tobias Snape, a Muggle, making him a half-blood (hence the name, "Half-Blood Prince"). This is rare for a Death Eater, as remarked in the last book, though Voldemort himself also had a Muggle father.
In order to conjure the avada kedavra curse, you have to want to kill your victim. We all know that Voldemort could easily kill a child without an ounce of remorse... but not Snape. Snape didn't want to kill Dumbledore, and this was why the spell was blue instead of the usual green.
For the Potter uninitiated, “always” is how Snape explains to Dumbledore in the final book why his Patronus takes the same shape as the one belonging to his long-lost love: Harry Potter's mother, Lily.
While we know Voldemort killed Lily, he did give her a choice. If she stepped aside and allowed him to murder Harry, he would spare her. Lily refused and sacrificed herself to save her son. That action (and Lily's love) was what gave Harry protection from Voldemort's Killing Curse.
Because she saw two alarming red flags in Severus' attitude. no real regrets for what he did. no real intentions to change.
"The first thing Snape asks Harry is "Potter! What would I get if I added powdered root of asphodel to an infusion of wormwood?" According to Victorian Flower Language, asphodel is a type of lily meaning 'My regrets follow you to the grave' and wormwood means 'absence' and also typically symbolised bitter sorrow.
Foxes are cunning, resourceful and fiercely intelligent – remind you of anything? That's right – we wouldn't be surprised if some members of Slytherin house find themselves with a fox Patronus. Foxes are also highly adaptable and can live in many diverse habitats around the world.
1 Harry Potter's Stag
Harry's Patronus, a stag, is certainly the most prominent in the series (and among the best Patronuses in the Wizarding World), as well as the strongest Patronus in the films. Unlike many wizards, he could produce his Patronus at the age of thirteen, with guidance from Remus Lupin.
He does not have a patronus, and has never been able to cast the spell.
Why did James Potter hate Snape? James said it was because Snape existed. Sirius said it was because Snape was into the dark arts. Rowling said it was to do with Snape being friends with Lily.
After Snape overheard the part of the prophecy he did, he told Voldemort about it. Voldemort determined it referred to Lily's child, and Snape asked him to spare her. Then he went the extra step and told Dumbledore in an effort to save her.
The reason that Lilly's death was a true sacrifice (as in she died though she needn't have) is the fact that Voldemort genuinely would have let her live if she had stepped aside and let him kill Harry. Snape convinced Voldemort to spare Lilly.