Read Microexpression

Study one creature’s face, scent, pulse, breath, posture, and voice. For the duration, you have advantage on Insight checks against it, and you know when its emotional state changes, when it is hiding pain, and when its body shows stress from a lie or omitted truth.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.