Place it just before the main reveal in a Teen Titans edit, then follow it with a teleport sound as the character vanishes or powers activate, and finish with a time stop sound before the next scene begins.
About this sound
This short clip is Raven chanting her spell, Azarath Metrion Zinthos, in a calm, focused voice that builds into something powerful over about two and a half seconds. It feels mysterious and darkly magical, like a quiet warning before her powers take hold. The line comes from DC's Teen Titans, where Raven uses it to focus her abilities.