QUOTE(Mchawi @ May 13 2009, 06:59 PM)
Would have thought evocation on the astral planes would be dangerous in general, isn't it like calling them into your mind rather than creating a space for a part of their world to exsist in ours?
It isn't really calling them into your mind. The astral plane is an actual plane of existence that you would travel to via your mind, through trance, meditation etc.
It is a distinct space.
However, depending on the spirit and your experience with traversing the astral plane and communicating with it's inhabitants, it could indeed be dangerous, just as any dealings with spirits could be dangerous if you do not take the proper precautions and protect yourself and banish afterwards.
Evocation on the astral plane is the same as evocation on the physical plane, it is just calling them or meeting them at a different place(plane). In the physical plane you would use your physical wand, in the astral plane you would use an astral wand consecrated through visualisation and meditation on the astral plane, in your astral temple.
I hope you can see how it isn't the same as invocation where you might call a spirit to inhabit your body or mind. It is just a different place to meet them.