When youre an actor, auditions always contain an element of mystery.

Youre never quite sure whats going to happen.

AHarry Potterfan since the sixth grade, Kim was quite excited for the opportunity.

So far, so good.

Then Yates dropped the first big reveal.

This character wasnt just any cursed person, butNagini.

Kim instantly realized the significance of the name.

I think my jaw dropped, she recalled to EW.

I was speechless for a little bit.

Nagini is Lord Voldemorts murderous snake in theHarry Potterbooks.

Then Yates dropped hissecondreveal.

And what was that like?

A lot of insecurity, she says.

You have to empty your head and trust your instincts and stretch your imagination.

I had to trust myself.

Claudia read it in a more moving way than anyone else.

She had a dignity, strength and a vulnerability.

Or: Five percent more snake.

So that was challenging.

At one point, Kim also handles a live snake, which was a bit of a hurdle.

Claudia Kim is a living god, Milller enthusiastically declares.

Youre about to get your head blown off.

Theres going to be a venom in your veins that youll feel just like love.

Prepare yourselves for Nagini.

This is a tragic and beautiful story that in some ways we already know the end of.

And for Kim, shes just excited for fans to see her interpretation of the infamous character.

I think It would be so interesting to see another side of Nagini, she says.

Youve only seen her as Horcrux.

Oh god, she laughs.

If I find it, I will destroy it!