Winter is here.

The second trailer for the seventh season of Game of Thrones has been released - and it's even more chilling than the first.

The two-minute video opens with Sansa Stark (Sophie Turner) walking through the snow as her mentor Littlefinger (Aidan Gillen) advises: "Don't fight in the North or the South. Fight every battle everywhere, always - in your mind."

Set against series composer Ramin Djawadi's haunting score, Light of the Seven, epic battle scenes filled with fighting and flames glide across the screen.

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The trailer ends on a solemn note with Sansa Stark saying:

"When the snows fall and the white winds blow, the lone wolf dies - but the pack survives."

Game of Thrones returns to HBO July 16.