If that's the only typo you found, then you're not looking very hard:-p Hopefully they'll have a few proofreading passes before actually going to press!
IMG_04:
Ogres: 'they lack', not 'the lack'. Also, missing the verb in the ending clause ('looking' or 'searching' for mates of their own)
Golems: 'if their creator is killed' - each golem is singular, and likely has a singular creator.
Rock Giants: as Toppins pointed out, 'they're', not 'their'
Slags: 'swamps or rivers' or 'swamps and rivers'. Not 'swamps to rivers'.
Ogre: "Smarts" as a word refers to pain, using it to refer to intelligence is slang.
Drakes: "one species of Drakes prefer forests." Should be "prefers," also the next sentence begins with "And" which is a no-no.
I don't think they should be capitalizing the names of these creatures in the description either. We don't go around capitalizing "dog" or "human" everywhere.
I think they have the troll and ogre images mixed up too. I've never heard of a one-eyed troll, but ogres very typically have a single eye in modern fantasy.
I don't want to go on, there's more but I don't like nitpicking like this. >.<
