I went out and bought myself Mythic Adventures and now want to implement it in our RotRL campaign, starting from the fall of a Napoleon at the end of book 4. I've been juggling with ideas of how the ascension should happen and these are options that I've come up with so far:
-They discover a legendary tome from the library and the book grants them the power.. Bit stale and leaves to wonder why the book is still in the library?
-After the Big Boss leaves Napoleon's body to die, the realization of "betrayal" triggers Napoleon to burst some of his dying power to the surroundings and the PCs get exposed to it, gaining Mythic powers.. Similar to the tome I feel it's not "personal" enough to feel legendary for the players.
-After the Napoleon falls, Desna descents to the mortal plane to warn the heroes of oppressing evil brewing in the world and grants them the powers in spite off Pharasmas prophecies for Desna has deemed the heroes as last hope of Varisia.. To anyone more familiar with the world and gods of Golarion, this probably sounds just plain silly, but it is currently my best idea, as I get opportunity to write a personal speech for each of the PCs and make the players feel special about it.
So.. I'm open to any and all kind ideas to help brainstorm how I could make the ascension happen without it falling flat.