Used with Creature and its subclasses. Armour decreases damage taken in Creature#damage. There are two ways of initialization:

1. Direct
        _armour_ = Armour
        _armour_ = Armour _protection_
2. Create a subclass
        class _Platemail_ < Armour
                def initialize; @protection = _5_; end
        end

You can change @protection at any time.

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