User blog comment:Ironreaper/Problems with the Catalyst/@comment-1341687-20120411182737

As far as #9, yes he has seen it, or at least whoever determined the necessity of the Reapers as the first species. This has been going on for at least a millenia.

Though the confirmation of this is inferred. A lot of this takes the assumption that it happened in this order of species and more. But it is very likely that they have knowledge enough that this will happen.

Without knowing the length of existence of the first major species we have to just infer that after an extend life period, they attained the light beings form whether through evolution or other means. As well as we must infer that during their cycle they either invented AI and went to war with AI, winning, or never made AI. They would have also made the mass relays having reached a high level of scientific thought and intelligence.

After their ascension as it were, the next dominant rising species would have come about and eventually created AI, fought with AI and in this instance most likely lost. The ascended (I call them Klencorans from now on, based on personal assumption as it being the planet where they ascended and left their organic forms behind) despite having gone beyond an organic form and all that goes with it recognize that organics must exist and if the current AI are left unchallenged then they will not allow or subjugate any further organics. This is the first of three times they ever interfere with our galactic existence. So they hijack these AI and "create" the first "Reapers". Recognizing the value of synthetic life as well they do not destroy them but instead send them into dark space.

The next organic(s) rises up inevitably creates AI and goes to war. Regardless of winning or losing the Klencorans are now aware of the repetition. As well as the possible oddity of their uniqueness in not creating AI as discussed earlier. So either in the aftermath or during the war they bring back their "Reapers" from dark space and begin their first harvest. It is either at this time using the AI or what they had done during their organic lives the Klencorans make the Citadel as well as a dark space relay and set-up their 50,000 year harvest. Seeing it as roughly the time as when things begin to go south for the past two organics. They also ensure the saving of the organics by combining them with the synthetics that they are saving in a way.

Repeat ad naseum. War between organics and synthetics keeps happening. Humans are an oddity as organics with their major cultural and biological diversity within their singular species. So the Klencorans are interested. But as far as the cycle goes its important to remember one thing.

If the Protheans hadn't messed with the Citadel and its recall signal then the occurrence between quarians and geth would have been essentially on par with what happened between every other species. Peace only occurred after the cycle had already ended. Something the Klencorans hadn't prepared for or even predicted. (Higher power arrogance and all that.) But their plan was already in motion so they opted to let it run its course. We can't predict how they would have observed or interacted with the cycle after us having seen an outcome never before that has happened both in peace with the geth and contact with the humans and more. Though just imagine the type of synthetics the yahg would make.

The Crucible is an object as a compilation of work from most likely they fourth organic species (earliest possible) and on. It is adapted to use natural parts of the Citadel to make its achievements. All parts cause an overload to properly disperse the effect across the relay. Blue is a signal aspect. Most likely the same signal creator that would have allowed and signaled the Reapers to come through. Red is a power source. Essentially it is almost a focused EMP for synthetic code. Green is the beam that is triggering everything, with Shepard throwing their self in it sees him as a code to apply through dark energy and it creates the synthesis. That last one is hard to understand but I'm having trouble properly explaining.