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Ruins are prominent in the Claim, and as a result, played a huge role in the Oseram's development as a tribe. In present Carja society, delving is mainly a luxury industry, serving the palates of Carja nobles looking for exotic finds in the ruins. Sunfall, their westernmost settlement, was built atop the ruins of the Zero Dawn Project Facility, Basadid, the Sun-King who ordered Sunfall's construction, believed the facility's location was chosen for strategic value. The catalyst for the Carja's creation was Araman's discovery of ancient texts in a ruin. Anyone who is caught venturing inside (with the exception of Seekers) will be made an outcast for a limited term. The Nora believe that the ruins are spiritually tainted by the sins of the Old Ones, and forbid entry. Perception of Ruins Among the Tribes Nora When the new human population left the Cradle facilities, they generally found the cities unnerving or foreboding, and began to build new settlements, leaving the structures to decay. Once the Plague wiped out all life on the planet, the cities, now in ruins, went unused and began to rust away.
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At the same time, bunkers were built to help make installations or for the military, as well as for Project Zero Dawn. Cities were used either as recruiting stations or as collateral damage during Operation: Enduring Victory. Conditions worsened when the Faro Plague began. These conditions led many manufacturing corporations like Faro Automated Solutions to construct armed machines for peacekeeping purposes. Focus devices and advanced aircraft and land vehicles.) However, the environmental situation was at an all time low.
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By the 2060s, they were used for transportation and entertainment purposes (i.e. A millennium before the events of Horizon Zero Dawn, the Old Ones had become quite advanced in the construction of machines.