Ewers Birthmark

The Ewers Birthmark (イーバーズ バースマーク) is a clearly "E" mark appearing in the region of the back of the right shoulder on all members of the Ewers bloodline, and to those who have been granted the birthmark through relationships. When a new member is encountered or a user is about to use Chi, their birthmark begins to glow a bright cyan color either that they sense a member of the bloodline that they haven't met yet, or activating their chi.

There are multiple colors within the birthmark itself with Cyan being a sibling and a full-blooded member, Royal Blue being a cousin or another relative not directly in the Family but is related to them, and a dark rose/crimson color meaning the Ewers is either showing a evil heart or being controlled by doing evil acts not on their own.

There are other multiple colors within the Ewers birthmark as well as the color of their chi mimics the birthmark's color.