Game Of Thrones Season 4 Trailer: Access Hollywood got the chance to talk with Actress Rose Leslie, who plays Ygritte on the show, about things to come in the upcoming season.

She hinted that things outside the wall in Wildling country are about to get a little more diverse - and scary - in "Game of Thrones" Season 4.

"They are ferocious," Rose told Access Hollywood at the NYC "GoT" premiere, of a group known as the Thenn. "It's gonna be good. ... They are so, so scary."

The Thenn are a clan of Free Folk, from very far north of the Wall. They only speak the Old Tongue.[1]

The Thenn are the most advanced and best equipped of the wildling tribes, as well as the most disciplined. They also shave their heads bald and engage in self-scarification.

Beyond the additional Wildlings, Rose's Ygritte has some serious emotions to deal with in Season 4, after letting her lover, Jon Snow (Kit Harington) escape with his life when he turned on her people to head back to Castle Black and the Night's Watch in Season 3.

"At the start of Season 4, we find her a completely different animal," Rose told Access . "She is a wronged, scorned woman and she's no more -- I feel -- the kind of playful, vivacious, character.

"She's very much restrained now, she's closed off," Rose added. "She shuts down. The dynamic between her and Tormund is very different. So, yeah, she's a changed person."

The new season boasts a new tagline, "All Men Must Die." Expect an all-out war between tribes and kingdoms in this must-see season of Game of Thrones.

"Game of Thrones" Season 4 premieres April 6 at 9 PM ET/PT on HBO. Watch the trailers here: