With Game of Thrones' upcoming eighth season being its last the risk of spoilers is higher than ever.

That means the HBO series went to some seriously high-tech lengths to keep things secret.

According to comicbook.com, actress Sophie Turner told fans about a 'drone killing' device.

If a drone flies above sets, there's a thing that can kill the drones which is really cool. It creates a field around it and the drones just drop. It's very X-Men.