Um was geht es dabei?
Paizo Blog
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What is mythic?The mythic rules offer a new way to play Pathfinder. It uses all the rules that you are familiar with, but it adds a new layer to the game. Mythic adventurers are elevated above their non-mythic counterparts, gaining powers and abilities beyond their reach that allow them to take on tougher foes and more daunting challenges. A mythic character takes on the agents of deities, rushes headlong into the abyss, and strives to build a legend, all while facing off against a wide variety of foes, from common monsters to other mythic characters. If Elric, Fafhrd, Gray Mouser, Hercules, or King Arthur were created in Pathfinder, they would be mythic characters.
Is this a replacement for epic rules?Mythic is not epic. You can use the mythic rules with 1st-level characters just as easily as you can with 20th-level characters. You can even use the mythic rules to continue to grow in power once your PCs reach 20th level, taking on some of the toughest adversaries in the game, from ancient dragons to demon lords. Meanwhile a low-level mythic character might take on monsters that you are already familiar with, at a level where non-mythic characters would face certain doom."