[quote=@Host] Because you have to know in order for your explanations to work. Your characters probably don't know either. Right now, you're using a superiority argument that doesn't hold water. Yet you're using the advancement argument. [/quote] They don't. One might but I'm not using them. Again, Dark was the one who would know. But he would have prepared for anything he knew of before he died. And not really, the explanations are pretty impossible to stop. Fusing a Source with it's Paths doesn't really have a counter. Because I'm in a situation where I know less than my characters, so it's hard to fill up holes. Again, you've done it before, you should know this. Knowledge advancement, not tech advancement. There is a HUGE difference.