回答
This is not a piece of advice to you I'm talking to myself for my practice of writing skills.
inquiry sentence → inversion sentence
1) We are never killed by anyone else. → Never are we killed by anyone else.
2) We are never to be killed by anyone else. → Never are we to be killed by anyone else.
3) We never need to be killed by anyone else. → Never do we need to be killed by anyone else.
4) We never have to be killed by anyone else. → Never have we to be killed by anyone else.
5) We should never be killed by anyone else. → Never should we be killed by anyone else.
I suppose that inversion sentences('1)2)3)5)') are good.
because the meaning of the sentence does not change between the former and the latter.
I can't tell that inversion sentences('4)') are good or not.
the meaning of the sentence are a little different between the former and the latter.