Place it just before the reveal in an edit, then follow it with a Vine Boom for the impact and a Dun Dun Dun for the aftermath, so the signal, the hit, and the pause land in that order.
About this sound
This is a 16.6-second siren sound effect, a steady electronic alarm tone with no voice or music in it. It feels urgent and tense, like a warning that something needs attention now, and it creates a sudden sense of alarm that makes listeners stop and listen.