Picked this up from BSN.
@7The Island Head
What if the Cruicble is the synthetic that kills all life in the galaxy????? And the Reapers are trying to stop you from making it! No one knows what the cruicble does so it probably is the synthetic that kills all the organics! It's the only thing that is built every cycle!
It explains everything!
As long as the plans for the crucible exist all life is at risk. Removing all copies of the plans would be impossible, for all it would take is one well hidden data drive and all organic life could be lost. The only sure fire way to protect life, is to prevent those with the capcaity of building the Crucible from having the resources to build it. So the reapers harvest all space faring races when the plans are rediscovered, to prevent them from building the machine that will kill all life, while preserving the essence of their civillization. The spare the none space-faring races for they do not have the means to build the Synthetic death machine.
2148 - Humans discover the plans on Mars
2157 - Humans make contact with Turians
Information becomes interconnected -> the reapers learn that plans have been discovered
2183 - ME1 -> Sovereign is aware of that the plans have been found, tries to start the cycle
2185 - ME2 -> Harbinger attempts to construct human reaper -> this reaper with the collect knowledge of humanity would be put to use in finding the plans for the Crucible and destroying them.
2185- ME3 -> Liara finds the plans in Mars Archives, which have been so far overlooked -> DOOMS EVERYONE
-> Reapers use Cerberus to meddel with the construction of the Crucible -> Due human genetics TIM is hard to control
Who are the Reapers?
The reapers we probably the last creations of the orginal builders of the Crucible, who probably were killed by the Cruicble but somehow stopped it, probably by seprating Catalyst from it. The aliens that build the Crucible died, and realized with the plans of the Crucible would live on, an all organic life following them would find the plans and build their own destruction. Hence why the reaper cycles.
What about the ending?
The reapers are trying to control Shepherd to prevent him from activating the Crucible, but his will power is too strong. TIM, against his will, is guarding the Crucible, the reapers will make him kill Shepherd and Anderson preventing the activation of the Crucible. Joker once he realizes that the space magic is synethic death magic flees the scene, this makes sense.
.. Actually kind of makes sense.