Mass Effect/Characters

Saren Arterius is a fictional character within the series of Mass Effect video games. He serves as the primary adversary of the first game.

Background
According to the character biography posted by BioWare, Saren Arterius is a former turian Spectre known for 'getting results' by any means necessary. More often than not, this meant he killed everyone and everything in range -- the target, any witnesses, and innocent bystanders as well. In the novel Mass Effect: Revelation, he is seen torturing and killing his victims mercilessly, rarely having any regards for human life. This seething hatred for humans stems from the loss of his brother in the First Contact War.

After the events described in the novel, and before the start of of the first Mass Effect video game itself, Saren takes command of an army of geth by using the mysterious artifact above the geth plannet (the one described in the novel), utilizing them to both do his bidding and oppose the efforts and actions of the game player.