Cindered Shadows adds four new units, a couple of new classes, an additional side story and an underground location for the base game.
The side story is surprisingly difficult and the maps can feel overwhelming at times, especially since you're given units with predetermined stats and classes for the course of the story, so you can't cheese your way out of it.
The new location, the Abyss, is an underground city which adds practical new uses for your renown from the base game, like increasing support levels between units or exchanging various items for renown (very useful for NG+).
As a reward for beating the new maps you unlock the Ashen Wolves one by one for the base game and their respective classes.
Now to the actual characters; in my opinion Hapi and Balthus are underwhelming and are easily powercrept by other units from the base game, Yuri is very situational and only Constance is the one unit to really shine because of her Dark Flier class, which is very handy under many circumstances.
Overall, Cindered Shadows is worth a play if you're planning to use the Ashen Wolves in the main game, but I wouldn't recommend getting it just for the side story alone.
The side story is surprisingly difficult and the maps can feel overwhelming at times, especially since you're given units with predetermined stats and classes for the course of the story, so you can't cheese your way out of it.
The new location, the Abyss, is an underground city which adds practical new uses for your renown from the base game, like increasing support levels between units or exchanging various items for renown (very useful for NG+).
As a reward for beating the new maps you unlock the Ashen Wolves one by one for the base game and their respective classes.
Now to the actual characters; in my opinion Hapi and Balthus are underwhelming and are easily powercrept by other units from the base game, Yuri is very situational and only Constance is the one unit to really shine because of her Dark Flier class, which is very handy under many circumstances.
Overall, Cindered Shadows is worth a play if you're planning to use the Ashen Wolves in the main game, but I wouldn't recommend getting it just for the side story alone.