Nibiru's Final Servitor

Imagine earth being visited every 3600 years by an advanced culture so developed that we would be unable to comprehend. Reinforced with that the ones who occupied  this rogue planet had awareness that without their intervention, earth would be destroyed. In this narrative, the ancient aliens provide earth with a protective deterrent. This strategy was effective for thousands of years while the rogue planet was separated by space, time and orbital proximity. However, before the next sequential encounter was to come about, the highly advanced planet would experience a catastrophic crisis. While earth continued to progress into its present day cycle, the story becomes focused  on a group of people on a quest for ancient artifacts.  One of the devises that had been constructed at the last occupation of the ancient aliens was discovered in a remote cave. More is quickly learned about these fabricated units as well as a shocking revelation that  earth is  on an unstoppable countdown toward its eminent  obliteration.  Even though the close  proximity of the two planets produce tremendous  shifts within the earth’s mantle, a most unusual bond develops between  the life forms of the older planet and the group of earth’s mortals. Being the selected few people that would obtain the knowledge of preventing the earth’s doom, they would soon be provided with an advantage from those of the superior culture.