Dhampirs wear two categories of tattoos. The first is a Promise Mark, to prove they successfully finished guardian training. The second type of tattoo is called a Molnija Mark and a guardian gets the mark added to her skin every time she kills a Strigoi.
This happened at my house. Then to make me feel better my mom said "you've read lots of sad books. And people died in those books and you were sad but you got over it". I then thought of all the sad books I've read and cried harder