I really like how this story plays out mechanically - how the author develops and presents the sequence of events. Drama/tension is really well done in this one.
But every time bloodline is brought up I can't help but wonder what the origins are. Creating the lore w/ a fairytale story (Ymir was given the power by God) is cheap but very effective. Also, magical bloodlines lol (Eldian, Ackerman, are there more?)