Comment by Satan on Eternally Regressing Knight - Chapter 28

@Satan   its not really clear how he got the power but death is fuc**** annoyed gaghha

@Bababui. It's the blue colored charm

@Bababui. in early chapters it said that he picked up the necklace by chance and that seems to be what is giving him the ability to revive. Whether they leave it to he just got it by luck or the story goes more into it will be for later on.