Talk:Sentient/@comment-74.104.114.128-20161107183819/@comment-25254386-20170322004339

The Sentients adapt to a damage type after a certain amount of their health has been lost to said damage I believe, and given how tough Sentients are to kill even a Reaper couldn't one-shot it. So if a Reaper did try attacking, the Sentient would become invulnerable to some type of damage during the fight; a Reaper wouldn't have time to kill it before damage adaption because the adaption isn't based on time. Also, we currently only know of three types of Sentients, there could quite possibly (and hopefully) be more with unknown powers. Their numbers are unknown too, but judging from the Second Dream and its trailer, there seems to be plenty enough to have a large army/armada that could easily be a on pars with the Reapers' numbers.

As for reverse engineering the Sentients by the Collectors, Orokin Technology is far more advanced than the Reapers, so much so that the Reapers would have an extremely hard time making an effective Sentient-Reaper hybrid. It would be decades before Sentient technology could be fully utilized by them, by then the battle would likely be done with.