I have been stacking since chapter 2136. Started reading around June last year and loved it!
It has its flaws obviously, but it is so CONSISTENTLY good and the author (G3) does a lot of experiments in the story, which I value a lot since it fills the novel with personality. Not only is Shadow Slave (SS) incredibly stunning with its worldbuilding, lore (YES, LORE), and main cast, it is also quite an easy read due to the author's word choice and sentence structure (some may find it ordinary which I understand, but I do value writing simplicity in fantasy stories - although I do have some exceptions since I am liking Lord of the Mysteries a lot!).
I know I am glazing SS a lot, but I recommend to everyone who has an itch for fantasy and for fights. The powers are so diverse and the scaling is mostly done very well, thus making fights not have predetermined outcome from the get-go.
However, I will say for the Power Fantasy peeps that SS is NOT a power fantasy novel. The protagonist is not the strongest and will never be the strongest in a world so filled with mysterious entities like SS (much like Klein in Lord of the Mysteries). SS values preparation, information gathering, analysis, and quick thinking in fights which was a breath of fresh for me at the time.
In summary, I love SS and I love to introduce people to it! I think it makes for a very fun read :)
PS: For those that do not mind slight spoilers and want to get a feel for the SS universe atmosphere (Dark Fantasy - Dark Souls-esque) I recommend checking out the OSTs published by Griffin Tyler on YouTube)