VogieVogaVogito's page

182) Earthquake
183) Tsunami
184) Angels falling from the sky, bursting into flame as they plummet to the earth below

I think Wizard, Monk and to a lesser extent Alchemist would be the least likely classes to multiclass into, as even level 1 is the pinnacle of time-variable study and training.
Druids, Paladins & Clerics can be seen through a change of belief.
Oracles and Witches would be based on an external happenstance.
Fighter, Rogue, Ranger, cavalier and to a lesser extent Barbarians would be based on a decision by the player to focus on the martial capabilities.
Gunslingers, Arcane Sorcerers and possibly Bards can be based on the discovery of the object in question.
Summoners and Non-Arcane Sorcerers could easily be spun an unlocked-potential story. "I was disarmed and suddenly I grew claws!" or the Eidolon appears in the heat of battle, protects the character, then vanishes... the PC wants to reach out to the beast again.

You could even go a "blood transfusion" sorcerer or a possession route for wizard/alchemist, as mentioned above. But honestly it would really depend on the GM if he wants "true organic" growth (The fighter didn't MEAN to get possessed, but now that he has, the next level WILL be as a wizard) or if he wants the option for storytelling purposes (the fighter wants to be a Wizard, so the GM must incorporate that into the story somehow)