‘Game of Thrones’ releases chilling second trailer (with Beric Dondarrion!)

On the first day of summer, HBO released a slew of promotional material for season seven of 'Game of Thrones,' all featuring the slogan: "Winter is here.

Brace yourselves Game of Thrones fans, because #WinterIsHere.

The second trailer for the seventh season of the epic medieval fantasy series was released Wednesday, and it’s even more chilling than the first.

As war scenes glide across the screen, we hear the voice of Jon Snow (Kit Harington) sending a cool message of unity.

“For centuries, our families fought together against their common enemy, despite their differences — together,” he says. “We need to do the same if we’re going to survive, because the enemy is real. It’s always been real.”

After more battle imagery filled with fire, and a glimpse of the long-lost Beric Dondarrion, the trailer ends on a solemn note with Sansa Stark (Sophie Turner) reiterating Snow’s message of unity.

“When the snows fall and the white winds blow, the lone wolf dies — but the pack survives,” she says.

Game of Thrones returns July 16 to HBO. You can watch the trailer and scroll through photos from the upcoming season below.