QUOTE (milk ducks @ Sep 17 2009, 04:20 PM)

I'm a little confused on how this stuff in Street Magic works, maybe you guys can help?
Let's say I follow the Voodoo Tradition (Possession-based), so Combat is handled by Spirits of Man.
Note that this only applies to certain services offered by bound spirits, such as assistance in spellcasting or learning new spells.
Every spirit can be sent into combat and Houngans may use Guardian spirits frequently for this task.
QUOTE
In Possession-based Traditions, a spirit's Materialization power is replaced with Possession, and when they use it against specially-prepared vessels, they have to make opposed tests to see how successful the merge was.
No, that's Inhabitation, used by Bug spirits and certain ally spirits.
Posession spirits only have to make a test to see wether they can posess a target or not.
Inhabitation is different from this.
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Also, I'm not sure how to get a spirit out of your own body once it's in. It says, "The spirit is under no obligation to return to its metaplane of origin if/when its services are banished away and will simply persist as an uncontrolled spirit indefinitely." Maybe I'm missing something?
Where does it say this?
Does this refer to Posession or Inhabitation?
Banishing explicitly removes the spirit from the vessel (cf p.101 of Street Magic) and leaves it on the astral plane.
If you prefer a more violent approach, you can simply knock the vessel out (or kill/destroy it), disrupting the spirit and ending the posession.
Or you cast Mana Static at an appropriate Force and disrupt the spirit with this.
Or -if you're the summoner and have services left- you just order it to leave.
If it is a summoned spirit, you could also just wait until the next sunrise/sunset.
QUOTE (milk ducks @ Sep 17 2009, 04:40 PM)

Okay, I think I've got it. So it also says that, in the opposed test, the Summoner can add his Binding skill as a bonus to either dice pool. So it should apply as a positive dice pool modifier in my favour, I think.
-milk.
That's also referring to Inhabitation.
There, this bonus would apply, as the Binding dice pool is involved.
This does
not work for Posession, as it requires either an opposed test between Spirit's Force x2 vs. the victim's INT+WIL or (in the case of inanimate vessels) a (Forcex2) (Object Resistance) test.
No Binding or Summoning dicepool is involved anywhere in the process.