Take the 2-minute tour ×
Science Fiction & Fantasy Stack Exchange is a question and answer site for science fiction and fantasy enthusiasts. It's 100% free, no registration required.

"[...] it is a monstrous thing, to slay a unicorn. Only one who has nothing to lose, and everything to gain, would commit such a crime. The blood of a unicorn will keep you alive, even if you are an inch from death, but at a terrible price. You have slain something pure and defenceless to save yourself, and you will have but a half-life, a cursed life, from the moment the blood touches your lips."

- Firenze

In the first Harry Potter book/movie, we found Voldemort drinking Unicorn blood. Why did he need Unicorn blood to stay alive? Maybe, a unicorn blood works on undead soul, but wasn't he already protected by his Horcruxes in terms of being kept alive?

share|improve this question
Related: How did Voldemort drink the regenerative potion without a body?, noting esp. the passage quoted in the Answer. –  hardmath Sep 4 at 15:11

1 Answer 1

up vote 53 down vote accepted

Voldemort never drank unicorn blood through his face on the back of Quirrell's head. Instead, Harry sees Quirrell leaning over the body drinking the blood himself. During the graveyard scene in Goblet of Fire, Voldemort talks about how he still had the power to possess animals, but the animals all died shortly afterwards.

I sometimes inhabited animals — snakes, of course, being my preference — but I was little better off inside them than as pure spirit, for their bodies were ill adapted to perform magic… and my pos- session of them shortened their lives; none of them lasted long….

Goblet of Fire, chapter 33 (The Death Eaters)

It's likely that by drinking the unicorn blood, Quirrell was preserving his own life.

Keep in mind that contrary to the movie, it wasn't Harry's attacks that killed Quirrell. He died because Voldemort fled his body:

“The servant died when I left his body, and I was left as weak as ever I had been,”

Goblet of Fire, chapter 33 (The Death Eaters)

Firenze was right, he really was only an inch from death, and it was only a combination of unicorn blood and Voldemort's power that kept him alive.

Alternatively, unicorn blood was one of the ingredients in the potion that allowed Voldemort to take his weakened baby-like form before his body was fully restored. So it's possible that by drinking the blood, Quirrell was somehow allowing Voldemort to create a physical face.

share|improve this answer
The first option seems very reasonable. –  Andrew P. Sep 3 at 15:54
This explains a lot about Quirrell slowly dying in HPMOR... –  Domenic Sep 5 at 10:45

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.