This collection of 12th Doctor comics contains 2 stories. The first is "Terrorformer" and the second is "The Swords of Okti."
WARNING: SOME SPOILERS BELOW!
"Terrorformer" has an interesting concept, introducing the race of Hyperions, sentient stars that used to be benevolent but then went mad and started destroying things until the most advanced civilizations, including the Time Lords, stopped them. The Hyperions are the main recurring villains through several more 12th Doctor comics. The story itself and characterization is pretty good, but the artwork is not in a style I prefer; neither the Doctor nor Clara really look like themselves. (Clara gets some especially weird facial contortions.)
"The Swords of Okti" mixes Indian mythology with life-sucking alien vampires, which was kind of cool. The villains are so-so, but the monsters are creepy and the "goddess" Okti is pretty cool, as she takes the form of a multi-armed Hindu goddess, similar to Shiva. It also introduces (or reintroduces) a character from the Doctor's past, who I was unfortunately not familiar with but you don't really need to know details for the story to work. The characterization is still fairly good (although I do find the Doctor sword-fighting Okti a little laughable) and the artwork is a bit better. The women all still look the same face-wise, but have different haircuts and outfits so you can tell them apart. (To it's credit, the story also has some homosexual characters.)
All in all, a decent but not especially ground-breaking or overwhelmingly good set of stories.