I don't mean Invasion Slayer. I mean like "WORT WORT STOP THE HUMANS FROM ADVANCING TO THE CASTLE WORT WORT" and then first team to 50 kills succeeds. Is that possible?
I think that is just Invasion Slayer. You can't have voice overs in any custom Invasion maps. Just player Invasion Slayer, set the score to 50 and have 2 rounds.
What I think he is trying to say is. a invasion phase with kills as the objective rather than ctf/assault etc. Answer : NO (I think)