Excellent supplement for Labyrinth Lord.
The most interesting part of this supplement are the spells, the monsters, and the artifacts and magic items (including the cursed books like Necronomicon and others). They are a must for any game that would be run in a Lovecraft-inspired setting, but also for many grim, sword & sorcery campaign worlds.
Now, I only give it a 4 stars because layout is mediocre (and I don't like the choice of fonts, art is average, etc.). Then, the new PC races, despite being appropriate, don't provide much originality. I mean, I don't really need this book if it was but for the races and classes (i.e. races as classes); I could easily improvise them myself. However, it's but a small part of the book. Spells, monsters and items are what is really important, and there is plenty of them.
[4 of 5 Stars!]