1. These bonuses only apply to your passive scores, not your active rolls. If you roll a Perception or Investigation check, Observant does nothing (other than increasing your Int or Wis score).
2. These bonuses stack with Proficiency or Expertise, if you have it. So, for example, a 17th-level character with 20 Wisdom, Expertise in Perception, and the Observant feat would have a passive Perception score of 10 (base) + 5 (Wis mod) + 12 (Proficiency, doubled by Expertise) + 5 (Observant) = 32 total.
D&D General - Feat Observant
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