I decided to see if I could get a character or two to level twenty and give them a try.
I'm now on my 8th character attempt to get a solipsist.
Out of those eight characters, only one, so far, has gotten "the ground is shaking" message.
That character died before going to the mission.

I really don't want to get that message again and then screw up my chance again- so if there's ANY complications in the Caldera mission, I'd like to know how to avoid them.
Thanks for the help
