Place this clip after your reveal setup and before the reaction shot, then follow it with the Enemy Spotted sound button for a callout, or layer the Inception Horn sound button underneath the final caption card for extra weight.
About this sound
This clip is Illidan Stormrage delivering his line 'In truth, it was I who was betrayed' over about four seconds in a deep, theatrical voice. It feels dramatic and bitter, turning a simple reveal into a moment of wounded pride and resentment. It comes from Warcraft III, where Illidan is a central figure.