From Guild Wars 2 Wiki
- Effect type
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Signaler is an effect that can be applied to various bounties in the Crystal Desert, as part of their Unstable Magic Abilities. It applies the Persistently Blinded effect to enemies that are moving when the Red Light effect is showing, or to enemies that are stationary when the Green Light effect is showing.“
Blinds players who ignore stop or go signals.
— In-game description