Roses curse mark:
Roses curse mark is a simple one on the surface. It's a curse mark made to better the user. It works like a rpg system, where the more people you kill, the more experience points you get. After a certain amount of experience points is obtained, Rose will level up. This gives her stat points she can put in a menu only she can see, where she can upgrade her strength, defense, health, luck, and charisma (which was maxed out already when she was level 1)
And what's a RPG without party members? Certain people that Rose kill are able to be revived and resserected and become servants she can summon at anytime. In 10 years later, she has a knight, a ninja, and a bear.
Another thing that happens is when people ask her to do stuff, Rose will get a HUD showing what she needs to do. This also gives her some exp but not as much as killing people. She also gets a daily quest that she HAS to do or else she gets stuck in a nightmare where monsters start to attack her for the entire night. She does not get exp if she beats the monsters in there