You have advantage on Wisdom (Perception) checks that rely on hearing or smell.
Keen Hearing and Smell
Raw data
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"srd": false,
"name": "Keen Hearing and Smell",
"page": 282,
"type": "entries",
"__prop": "raceFeature",
"source": "DMG",
"entries": [
"You have advantage on Wisdom ({@skill Perception}) checks that rely on hearing or smell."
],
"raceName": "Grimlock",
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"raceSource": "DMG"
}