If you haven't watched Game of Thrones, season 7, episode 6 ("Beyond the Wall"), click on some other article now coz here are all the spoilers.
We lost one. One of Daenerys Targaryen's beloved dragons, in fact, which fell in an unexpected battle. Daenerys helped her nephew, Jon Snow who went beyond the Wall in the last episode to capture a White Walker to bring to Cersei Lannister. All this to get the queen to side with the living in a battle against the undead.
Daenerys had her three "children" come along to save on and the Westerosi Suicide Squad. Everything was going fine at first until the Night King ruined everything by throwing an ice javelin straight into Viserion's chest causing the damn creature to crash and burn.
But yeah, it definitely gets worse. Towards the end, we get a peek at the army of the undead carrying massive chains across the ice and passed the Wall. What's at the end of the chain? Viserion's dead corpse of course. The Night King walks up to him and puts his hand on him signaling that it's about to go down.
So that's that on that. There's only one episode left of this penultimate season of GOT. With all the hacking going down, we can only hope the finale actually remains a damn secret.