anon fem's page

I wanted to know how synthesist's temp hp, diehard, and the fused link ability, is supposed to interact with the summoner's eidolon being banished. There was supposed to be an FAQ on it already, but I'd like to know where it is if anyone knows, My gm said it was fairly hard to find the first time, and I'd rather not make him look as I am only curious, I respect their ruling.

when casting a buff spell on someone and the duration has not yet run out, how does the rule apply? is it a second spell effect? does it extend the duration? does it overwrite the previous one?

Is sunlight vulnerability from the race guide something that only happens in sunlight? IE, are you affected in cloudy or stormy weather?

How does one go about this? especially if its something like a weapon?