Season 5 of “Game of Thrones” gave fans one of the most mind-blowing battle sequences of the series with Episode 8, “Hardhome.”

In the battle, Kit Harington’s Jon Snow fought against an army of wights (reanimated corpses) as the White Walkers arrived at the free folk settlement, Hardhome. There was an intense face-off between Jon and a Walker, lots of skull smashing, and, most shockingly, the return of the Night’s King. The sequence was, overall, one of the most impressive visual spectacles on television and now a new video from visual effects company El Ranchito reveals how it was made.

The reel shows all of the CGI work and practical effects behind the roughly-20 minute sequence, which Harington previously told The Huffington Post took an entire month to shoot. The actor also told Entertainment Weekly that he shot each of his fight sequences from the battle three times, which he said was “twice as hard” as Season 4’s Battle of Castle Black. If the “Hardhome” breakdown video doesn’t earn “Thrones” its fourth Emmy for Outstanding Visual Effects, then nothing deserves the winged statuette this year.

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