(Warning: spoilers ahead.) The spectacular Game of Thrones 'Hardhome' battle scene with white walkers, zombie-like wights and wildings is pretty VFX-heavy, judging by a new video from effects house El Ranchito. Highlights include Jon Snow slashing a walker into shards of crystal, battle scenes with the giant Wun Wun, and wights -- so many hordes of wights. Despite having TV's highest budget, the show doesn't rely overly on digital effects, using them sparingly on gore and dragons, we imagine. However, Snow actor Kit Harrington said that the 'Hardhome' battle "is so CGI-heavy it's unlike anything I've ever done on Thrones."