I´m at long last trying to write up a magic system for my very own fantasy campaign, and I´ve hit a little snagette. Being aware of my status as a total n00b at Hero, I turn to you, the-finest-minds-of-Herodom and sundry.
The basis of working magic in my little world is through summoning and negotiating with spirits of various kinds, ranging from the guardian of a candlelight to the very foundation of the world, Gnome himself. These spirits live in another world, and magi and spirits meet in the Between, overlaying and just a shadow away from either world. The spirits travel between their world and the Between rather easily (and on to the mundane world with a bit more effort), but all magi except the most powerful has to "stay put", as it were.
Now, the tricky part is: How do they communicate from the mundane world to the Between? The advantage Transdimensional (+1/2) fits the bill, but how to use it? Should I give the mages Transdimensional Sight and Hearing? What would that cost? Or should I build a new sense with Detect the Between? How exactly would that work?
I´d be happy for any insights and all input will be considered. I think.