Support
While using Dark Sight, decreases Dark Sight noise and increases sounds of enemy Hunters in the direction you're facing.
The game calls this a Black Trait: found only in a contract and never sold, but unlike most contract-only traits it is not consumed when it triggers.
Sources: game_hunt/livedata/libs/gamedatabase/metatraits/supportive.xml · game_hunt/livedata/libs/gamesettings/traits.xml · localization/chineses_xml/chineses_xml/text_ui_traits.xml · localization/english_xml/english_xml/text_ui_traits.xml · localization/russian_xml/russian_xml/text_ui_traits.xml