司空震在地下城发现了机关兽并私下研究，武则天发现端倪并派上官婉儿私下调查，而尧天组织也有自己的打算……几股势力交织在一起，暗潮涌动。在最终爆发的共同危机面前，众人还是为了长安的安危，力排万难，合力解决了机关怪兽，长安城恢复了安宁。
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