QUOTE (Jaid @ Jul 2 2008, 06:42 PM)

do you actually have any rules quotes to back *any* of that up, or did you just make it all up off the top of your head?
i did
on the fly because i hadn't got the book at hand but now that you ask i rather explain it with the needed pages of street magic. The thing is i usually read all the content of the books i have and it's dificult to find where the info is.
All the info about living Vessels can be found on page 86 of street magic. As they tell, you can have a living Vessel to participate willingly or just helpless (i think petrified count as helpless). During the process you spend two refine or one radical reagent (maybe be some magic copper rust paint, some awakened deer ashes, whatever you want and you use it to attune the Vessel). Just for some extra info, insect shamans craft cocoons for Vessels using almost anything at their hand (usually living metahumans also).
About the liberty of movement of vessels is on the same page (86) when starts with
object vessels.
About how the possesion is played you have a little paragraph in page 95 of street magic that tells how people feel when they are possesed and also that the magician is also taken into account as a preparated Vessel.
About inhabitation (the equivalent of bonding for possesion tradition) it's explained on spirit powers (page 100) and it clearly tells that the spirit is not disrupted until the Vessel is killed by overflow damage.
ABOUT EXPIRED SERVICES you can find what they tell you on page 100 in the black box of hybrid forms, they clearly tell you once the services are banished the spirit doesn't has the obligation to return to his metaplane and it remains as an uncontrolled spirit indefinitely (The Vessel is now a part of the spirit right?) (flesh form doesn't tell but it's assuming is the same). All after that, i told are some of the reactions that free spirits have and some GM could see apropiate.
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No, you don't have to re-prepare a vessel. Once it's a vessel, it's a vessel. Any number of spirits can leave or enter any time, as many times as it wants to, and it won't "wear off."
Depending if it's a living Vessel or a inanimate one. Of course if we think as living vessel some kind of subordinate of the magician for possesion duties the preparation can take form as tatoos and the like (this is pure GM discretion and explained in an imaginative way, it's not in the book).
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If I have a spirit possess me, what can my mind still do? Can I still sustain spells? Cast Mana spells?
In one of the pages i metioned before you have it explained. Saving time, a spellcaster possesed by his own spirit (meant magical one) acts like a rigger in a drone altough it has to move it like using comands. Think of it as the magician can see with his eyes, but to move his body has to ask to some servant to do that.
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If not, what if I went to astral space first and then let the spirit have my body? Could I then do those things?
As ancient history told, you are separated of your body so you can do anything you want. By the way, is a good procedure to assure your body has protection while you are out.
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Do Spirits actually have to make a possession test if the vessel is willing?
Theoretically yes and in inhabitation is compulsory because the result depends on the throw.
For possesion, personally, i won't make any throw at a willing target (but as said before Ancient, GM discretion)
Also as Jaid said, channeling metamagic empowers possesion to new levels of satisfation as you can move your body and call spirit powers at will (altought this spends services, but i you get your ally Spirit.... you won't have that problem).
I know i'm quite new on this forum, but i assure you i carefully read each book i get

. I'll try more often to tell you the pages of my explanations.