I can't remember the books, but they were in series - I think the sixth one came out not more than 2 years ago. All of them are rather fat (>600pages).
Anyways, it was about prehistoric times, when humans still had caves, and there was some sort of a war between tribes. There were unknown lands and travel.
Iknow it's an extremely vague description, could you list some ideas - I remember the sixth cover, and would recognize it immediately (it was reddish).
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