According to the novel Mass Effect: Revelation, the Prothean empire was wiped out approximately 50,000 years ago, long before humanity had even reached the Cro-Magnon phase of development. Despite their complex technology, the Protheans were methodically wiped out by a race of sentient and genocidal machines known as the Reapers. Though the species was exterminated, a select few surviving Protheans managed to leave behind a series of clues and warnings of the Reapers' impending return which are discovered over the course of the games. (Wikipedia Notes) I hope you will enjoy "How to Draw a Prothean." Please fav, show your love, and comment. Thank you all. Peace and love to you.