Description from original post (created 2016-03-04 08:29):
I think I did a good job...
Captain (formerly Admiral) Vor is the first boss in WARFRAME that players will encounter and is one of the few figures in the game that understands ancient Orokin technology, capable of utilizing it and merging it with Grineer technology to create offensive weapons such as his trademark Seer pistol and his armor, which is powered by a Void Key
and grants him a powerful ranged beam attack. Captain Vor can be
encountered in three locations currently, making him the most recurring
boss beside assassins.
First appearing on Mercury and thus being the first boss that players
must fight, he then appears again, somehow fully alive, on Phobos as a dual boss battle alongside Lieutenant Lech Kril, then appearing later yet again as a Corrupted version of himself within the Void.
http://warframe.wikia.com/wiki/Captain_Vor