1 out of 5 rating for Pathfinder Roleplaying Game: Mythic Adventures
Beware!
This book is gorgeous, and the power it offers to the players is very tempting.
But if you use it in your campaign, it'll break your game, as the rules are so broken, that the players after Tier 2 will become invincible. They will easily crush any opposition, including Demon Lords and other Big Bads.
One of the absolute worst aspects of the ruleset is that, when a character gains Mythic powers, it is MUCH EASIER to gain experience, so he will gain normal and mythic levels FAST.
So, to make this book remotely useful, you have either to limit your players to Mythic Tier 2 or less (so what's the point of going mythic?), or LIMIT IT TO MONSTERS AND NON-PLAYER CHARACTERS (I personally suggest this course of action - but again, no need for this book in the first place).
To make matters worse, the book completely misses the point of a Mythic style of play. For the authors, Mythic equals more powerful. That's silly. Mythic is when the players do some earth-shattering thing, or when they mess with archetypal beings and situations; in any case, there is no need of being more powerful.
As a consequence, an already crunchy game as Pathfinder becomes even more crunchy! What-a-nightmare!
So, if I was to consider this work as a gorgeous collectible, or as a rule system RESERVED FOR NPCs, I'll give it 2 stars.
But with this Paizo lost a wonderful opportunity, and built a rule system that destroys your game when you use it. So, 1 star.