The undead dragon is gonna burn down the wall. That was the whole reason for the terrible plan to go north of the wall and catch a wight. They needed a reason to get the dragons north of the wall because they couldn't figure out how to get the army of the dead past the wall.
Edit: it doesn't seem like fire kills the undead btw. The undead bear got caught on fire and seemed completely fine, it wasnt until the sword/dagger to the dome that he went down

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Gonna let them fight it out and then I'll reign. God....