In season 7 we witnessed the Jon Snow and company stuck beyond the wall and daenerys coming to help them. Unfortunately viserion, one of dany’s dragons, was hunted by the Night King. It drowned into the lake and later pulled back and converted into an Ice Dragon by the night king.
Though, we are still unsure on what kind of dragon it currently is. Is it like white walkers or something else entirely?
We also saw its power when it broke the wall that stood for centuries and known to have magic in it. This has changed the whole game. Defeating the dead is not possible without defeating this dragon now.
Even seas and islands cant save them now since Night King can fly and wreak havoc upon them easily.
There are only few known ways white walkers can be killed. I assume that Viserion is the same and can be killed through one of those means.
1. Fire
White walkers are known to be killed by fire. We have seen it already on numerous occasions in the past seasons. Fire even helped kill the Ice Bear in Season 7. We also saw Beric killing many of white walkers with his lightning sword. And then we saw Jon demonstrating it in the Grand Meeting.
Although we are not sure if Fire can actually kill the Ice Dragon as well. At least we can agree that it can harm it to some extent, and make it weaker. A possibility is an arrow with fire to be fire at that ice dragon just like one that brought drogon down.
A man powerful enough like Night King can throw an arrow at it too. Just as the Night King did to Viserion.
2. Other Dragons
Second and the most believable way to kill the Ice Dragon would be other dragons killing the Ice Dragon. The dragon fire can surely harm more than the normal fire. And Drogon is strong enough with powerful teeth to tear Viserion apart.
Dragons are usually considered a killing machine with no emotions. But these dragons have had the love of their mother, and they might feel hesitant in attacking Viserion. Daenerys will also have to make this hard choice one day. If they show any hesitation, they will be gone.
3. Dragon Glass
Third known option is the Dragon Glass. Jon Snow had been mining lots of it. It can kill White Walkers, and if it can be attached to the arrow large and powerful enough to kill a dragon, it can harm Viserion severely, and could even kill it.
We might see more use of Dragon Glass in some other form. As Sam has been reading about it, he might have discovered something that could help create a new kind of weapon that could help target both white walkers and the ice dragon. Just like wildfire did to people.
4. Drown into Water
Forth Option would be to drown the ice dragon into water. For that they will need to bring it down.
When Jon Snow with his friends went beyond the wall and got stuck on a small island, many white walkers fell into the melting ice lake and died. This assures them that water can kill the Ice Dragon as well.
Ice Dragon might be flying over the ocean soon. And If they do something from the ships, they may bring it down just like Drogon was hit by an arrow.
But, flying over oceans mean that wights will have captured huge territory. This would make fighting them more difficult as their numbers will also be growing.
5. Valyrian Steel
Number five, The Valyrian Steel, that can kill white walkers. It might also kill the Ice Dragon.
But for this, either they will have to make a valyrian arrow, or approach the ice dragon closely to attack it with a sword.
I won’t be easy to just approach viserion and the Night King this way. The best bet is to use Valyrian Steel arrows.
Hopefully Sam has something on it as well. He might have the actual formula for creating the valyrian steel now. If he has it, it will be a huge plus for them.
6. Wild Fire
Number six is Wild Fire. We have seen on 2 instances it has been used. Very recent was when Cersei took her revenge and killed almost every enemy she had there. Wild fire is really destructive, and it can bring down whole army of wights. But how can it kill Viserion? Again, they will have to convert it into some kind of weapon that could hit the Ice Dragon.
Or, they could trap the Ice Dragon within some closed structure, or make it into a bomb to have an impact in the air.
That wild fire though, can also harm their cities and kill many of the people. And it would have to be used very carefully.
I personally think, they might use it, but not on Viserion. It would surely kill many of the white walkers.
7. Kill The Night King
Number 7, the most difficult of all, is to kill the Night King. This is the toughest thing they can do. But if they do it, it can bring down all white walkers, white Giants, and the Ice Dragon.
We have already seen in the past that killing a white commander also destroys all wights he had created. Since all wights were created by the Night King, we can expect that wights and the Ice Dragon would vanish instantly.
But Killing the Night King, it looks easy on paper, but very much impossible while he has the Ice Dragon. Drogon might help with this, or the large Dragon Glass Arrows with Fire on them could kill him. But we are not really sure what other powers the Night King has.