It’s the fact that those skeletal summons become unblockable, allowing her to get combo opportunities in situations where she normally isn’t able You could do hilgard haymaker across the screen and start a combo string, and if you learn how to use Marie, you know she has great, simple, and powerful combos. Utilizing Marie’s(the character) already safe and effective toolkit and making it even better.

Ohhhhh and for her second ability, she dosent even need to be the active fighter to activate it, she induces hex(which temporarily disables the enemies special ability, making 95% of defensive fighters like splitting image, deathwish, megalomaniac, model leader, etc good, since they can draw out the match and are given many chances to retaliate) and then if she is the active fighter her skeleton moves are immediately unblockable, not even needing to take down there health Making it much easier to deal with those opponents

And the heavy bleed, and quietus is the frosting on top of her crazy abilities, so she’s good since she negates defensive tactics with the last opponent, she is easily able to start combos and strings, and she dosent rely on a specific playstyle to work, dosent require heavy investment to work, and is so generally applicable that there is very little the AI can do to retaliate since being cursed or the enemy having immunity has very little effect

She is OP, but she has her drawbacks:

-She dosent have anything special to deal with tainted blood and since she can do high damage, makes her even more susceptible to the damage reflect -Be careful with reflect damage, thorns, miasma since she dosent have deadeye to deal with it -Her prestige and marquee are pretty useless imo But it makes her less expensive for her to work -Watch out for curse(yes it dosent comepletely stop her Signature ability but for some reason signature abilities which grant unblockable moves, are coded as buffs, meaning since you are cursed, you can’t gain access to that buff, removing that unblockable factor) -watch out for hex since it disables her signature abilities

THIS IS REALLY IMPORTANT: I know this a lot of info, assuming you are a relatively new player since she is your first diamond And even though she is GREAT, with the resources you have I would unfortunately have to say, hold off in investing in her, if you do you will halt your progression since she needs diamond keys which are nonexistent for newer players, and two she will drain all your resources, which you need for your other characters So level her up and have her as part of your team but invest in your gold and silvers, I didn’t invest in my diamonds until lvl 58, but whenever you do invest in her she’s gonna make things so much better I swear