The Wall:
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The Wall is a massive Xiticix structure spanning the entire length of the continent, from what was formerly Vancouver to what was formerly Boston. It is over 5 miles thick, stands over 60 stories high, and is made from the same super-dense MDC material which all Xiticix hives are formed from. No reconnaisance teams sent to The Wall have ever returned alive, and therefore nothing is known about the internal workings of the structure. There is a 15-mile "dead zone" south of The Wall which is now uninhabited, as anyone seen entering this zone is immediately attacked by swarms of thousands of the creatures.