Change: updated Insidious with the Undetectable Status Effect.
Audio Cue
As soon as a stealthy Killer starts to move again, thus cancelling Insidious, a loud sound cue titled "Stinger" plays to warn Survivors:
Trivia
Since the introduction of The Pig, the Terror Radius gradually fades away instead of being instantly gone after Insidious becomes active.
The Killer still makes breathing noises while under the effect of Insidious, which is a way for attentive Survivors to still notice their presence.
Before Insidious was updated with the Undetectable Status Effect, its description mentioning a stealth ability confused many (usually newer) Players into thinking of the ability turning the Killer invisible, rather than just masking the Red Stain and Terror Radius.
Some languages even outright mistranslated the stealth ability to mean invisibility.
Using a Killer's Power will automatically cancel Insidious.
However, moving your camera around, stalking Survivors as The Shape or The Ghost Face or phase-walking as The Spirit will not cancel Insidious.
Setting a Bear Trap as The Trapper will not cancel Insidious either.
