Talk:Stalker/@comment-9018486-20130508232448/@comment-188.104.16.101-20130518193347

You first need to kill an Infested boss like Golem or Phorid or you need to kill an Corpus boss like Jackal or Hyena and then play a little then Stalker will appear with a message that he revenges Golem, Phorid, Hyena or Jackal