When you think of threats in Game of Thrones, the first thing that comes to mind might be Daenerys Targaryen and her dragons or maybe even the Night King. But does anyone remember the ice spiders in Westeros lore, which Old Nan told Bran about several years back?

In the series' first season, Old Nan told Bran bedtime stories about The Long Night, a time in the Age of Heroes when darkness fell upon the known world for a whole century. During this time, famine and horrifying dangers appeared, including the White Walkers and, yes, a scary species of ice spiders.

So it seems fitting that the 2020 Game of Thrones calendar George RR Martin recently shared on Twitter shows off these ice spiders on the front cover, as the upcoming prequel series is rumored to be called The Long Night (and it was Martin himself who let that tiny detail slip).

It's an interesting illustration, and could be an early glimpse about a terrifying new creature we might soon get to see in Westeros—if not in the upcoming final season of Game of Thrones, then possibly in the prequel.

Game of Thrones Season 8 is scheduled to premiere in April 2019.