Sanguine Secrets

Draw knowledge through the blood of one creature you can see within range. You learn its species or creature type, whether it is above or below half hit points, and whether it has resistance, immunity, or vulnerability to necrotic, poison, disease, bleeding, charm, or fear. The next attack roll or Medicine, Insight, or Intimidation check you make against it before your next turn has advantage.

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