What is the tattoo that Rosa gets after she kills the striogi and what does it look like

wich book she kills 2 in frostbite and gets 2 moliniga marke
in shadow kiss she kills a lot and gets a spetial mark that says she was in an epic battle

she killed a lot in blood promise but didnt get any marks because now one new

and moliniga marks look like 2 lightning bolts crosed like an X