Board Thread:TV Show Discussion/@comment-5774411-20170822010733/@comment-28895263-20170901184318

The Viserion we saw at the end of S7E7 had damaged wings from his death fall, or the ice spear. That makes a solid case for wight-dragon, vs. white-walker-dragon.

Like any other wight, he can be damaged to dysfunction by conventional weapons, or destroyed by dragonglass. Still an open question as to whether wight-Viserion might be vulnerable to dragonfire, from a living dragon.

Personally, I would deploy a flight of two Dothraki Longbow Dragonfire Gunships. Rhaegal could carry two Dothraki archers, as well as a pilot. Drogon, four archers, and maybe even a small ballista. All armed with dragonglass-tipped rounds.