Talk:Excalibur/Umbra/@comment-65.128.189.119-20171126120022/@comment-2001:1970:501A:7800:C482:6AA8:59B5:A09A-20171127032401

They're not going completely destroy one frame to "upgrade" it. Sacrifice is probably a quest that is the next step after the war within. Plus with your concept of upgrading would take away excalibur prime which is not going to happen. So if anything sacrifice would be more gear towards the operator rather than the warframe. Also warframe and tenno alike are seen as evil itself so the definition of umbra is shadow makes no sense, therefore the upgrade probably is more like a work in the shadow kinda thing. Something that wasn't supposed to be made but was, in secret from the orokin council.