Board Thread:Questions and Answers/@comment-30785465-20180101215437

So during the times of the ancient Eldian Empire, how did they manage to turn subjects of Ymir into normal mindless Titans without the use of Titan serums? I'm guessing that before the Great Titan War, they definitely didn't possess the technology necessary to extract spinal fluid then inject it into someone, so how did they turn into Titans, from the scream of the Founding Titan? 