Lower male voice. 

Silas is 28 years old. Very cold and very distant. He was pretty quiet before the outbreak but after losing all of his family to the apocalypse and having had to shoot his zombified sister  he became more cold. He doesn't trust easily and doesn't like for others to be weak as they can slow them down. He's the most level headed and mature one in the group. He's got great survival skills which is why the rest of the group often comes to him for training and advice. Before the apocalypse he was in the reserves, having gone into battle a few times. Because of that he does have a little bit of ptsd.