Talk:Excalibur/@comment-103.254.87.214-20180615105544/@comment-2604:6000:A24C:5600:8559:26F8:F202:81DA-20180615115033

Well, Umbra only refers to Warframes that aren't controlled by Tenno normally, as in they can fight without needing an Operator to steer them. So, Stalker/ Shadow Stalker is probably one of those, and as I keep saying, he's probably filled with the Kuva of the fallen Orokin since he witnessed the slaughter and was there, and it would explain the whispering voices when he appears/ disappears and his intense hatred for only the Tenno