Long ago I reviewed Diablo III: The Book of Cain, and as you might guess, Diablo III: The Book of Tyrael continues on similar grounds, expanding the lore and adding some new beautiful drawings into the mix.
This title is not as appealing as the first one, because it picks most of the texts and notes from the Diablo 3 and often merely expands them, decorating the content but not really adding anything new. It does however fill details only vaguely hinted at in the game, such as the witch Adria's background, and a lot of filling around the factions, clans, character classes and cities seen and mentioned in the game.
Having notes from multiple sources (Leah, Deckard Cain and Tyrael), at times feels a bit chaotic, but in general works nice and makes it feel a bit more "casual", a collection of notes joined together instead of a real book. I disliked a bit that the font is a bit small and the background is not bright enough, so at times is not easy to read the text, I get that the illustrations are great but legibility should come first.
Sometimes interesting, sometimes boring, that's my general feeling about it.