There is no wand more powerful. It answers to you, and to you only.
Read more Professor Severus Snape QuotesFrom: Harry Potter and the Deathly Hallows: Part 2 (2011)
Luna Lovegood : Harry, wait, I need to talk to you.Harry Potter : I'm a bit preoccupied at the moment, Luna.Luna Lovegood : You won't find it where you're going, you're wasting your time.Harry Potter : We'll talk later, ok?Luna Lovegood : Harry!Harry Potter : Later!Luna Lovegood : Harry Potter! You listen to me right now! Don't you remember what Cho said about Rowena Ravenclaw's diadem? There's not a person alive whose seen it. It's obvious isn't it? You have to talk to someone whose dead.
He knows if we find them, and destroy all the horcruxes we'll be able to kill him. I reckon he'll stop at nothing to make sure we don't find the rest. There's more, one of them is at Hogwarts.
That doesn't sound good.