Detect Vulnerability

With one minute's unbroken observation, you are more likely to detect the greatest vulnerability, flaw, or weak point in the design of a material or immaterial object. 

When you cast this spell, add 1d8 to either your Investigation or Insight roll. 

Upon a successful Investigation roll, you are able to detect the most vulnerable part of a single physical object, such as armor, a machine, a body, or a construct. The roll is against the object's base Constitution AC, or at the DM's discretion.

Upon a successful Insight roll, you are able to detect a weakness or vulnerability in a creature's mind, personality, or ego. The roll is against the creature's base Wisdom AC, or at the DM's discretion.

This spell does not help the character identify how to utilize this knowledge. It does not work against entities with numerous fluid parts, only singular visible parts. (For example, you can detect a weakness in a soldier, not an army; a wall, not a building.) It also does not work against complex metaphysical ideas, e.g. "plans," "arguments," or "systems."