Warrenbred Hobgoblin

Your ancestors lived underground. Your ears are larger than those of other hobgoblins and sensitive to echoes. While you're underground, when you target an opponent that is Concealed from you or Hidden from you, reduce the DC of the flat check to 3 for a concealed target or 9 for a hidden one. In addition, if you roll a success on an Acrobatics check to Squeeze, you get a critical success instead.