What scares me is it sounds like they're threatening him with some kind of invisible killer.

But Her champion had no idea how to fight invisible killers armed with magic.

You don't have to show the statistics or a photograph of an invisible killer to tell the story.

Taking a step back, Babette swung to face the invisible killer.

That has made one of Africa's leading killers shockingly invisible.

Their battle with the invisible killers was brief but belated.

Almost everywhere, they say, lurk invisible killers, from radiation to asbestos.

As you've seen, many other races come and go, and are not bothered by the invisible killer.

A Klingon can fight almost anything in the universe but the invisible killer.

From the day he got out, he would apply himself to spreading the invisible killer.