It's going to be a massive fallen walker, and the only way to break it's armor is to shoot it with a special rocket launcher that spawns in random areas of the map protected by giant captains(Kells/priests whatever).
The RL will hold only 1 shot and can break one leg, after the leg armor is broken the walker can only be damaged by super attacks.
This is fact.
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Fact how?
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The fact its a garbage idea, duh