Crimson Eternal – WolfShine

Aria has one special ability, but it’s a doozy - She’s a true immortal. She can’t die, she can’t age past her prime, and she recovers from damage. The more often she encounters a source of damage, the more quickly she recovers - to the point where her go-to method of fighting strong enemies is to run up to them carrying explosives and then set them off.

The early part of this series is strong. There are new characters, world building, and Aria’s initial growth. The growth takes a very-unexpected direction when she is identified as Death - i.e., one of the four Horsemen of the Apocalypse.

As the series progresses, Aria becomes increasingly detached and bored. (The detachment starts with fear of losing people she cares about, and grows with a realization that she will outlive everyone she knows or will ever know. The boredom is somewhat self-inflicted.) This makes the latter books weaker, because it is harder to care about a protagonist who doesn’t care.