[JustADude]

I gladly welcome to think that they are able to interact only with enchanted items or with beings that have living aura.

I'd been thinking of just running with the house rule of only allowing prepped vessels for any possession.  Seems too disruptive otherwise.

Wow... congratulations, you just made Possession Spirits almost totally useless in one fell swoop.

Remember, Possession Spirits can't materialize independently. That means, if they're limited to prepared vessels, then they have no way to pop in by surprise and start wrecking drek up... something Materialization Spirits can do any time, any place without needing any type of vessel.

[Mirikon]

What people often forget is that spirits need to make an opposed test in order to possess their vessels. Now, a living vessel that is willingly allowing the spirit to possess them can choose to automatically fail that test, but otherwise the spirit has to win the check or they can't possess that vessel. All preparing a vessel does is gives the spirit a +6 to try and possess the vessel. If the dice gods hate you, it is quite possible to fail to possess a prepared vessel. Likewise, if the dice gods are kind, you can even have a spirit possess an unprepared dracoform.

[All4BigGuns]

I gladly welcome to think that they are able to interact only with enchanted items or with beings that have living aura.

I'd been thinking of just running with the house rule of only allowing prepped vessels for any possession.  Seems too disruptive otherwise.

Wow... congratulations, you just made Possession Spirits almost totally useless in one fell swoop.

Remember, Possession Spirits can't materialize independently. That means, if they're limited to prepared vessels, then they have no way to pop in by surprise and start wrecking drek up... something Materialization Spirits can do any time, any place without needing any type of vessel.

You made me wonder something. If someone gets enough hits summoning their possession spirit, can they add materialization as well as one of the 'extra powers'? I'm just not real clear on just how exclusive those things are.

[JustADude]

You made me wonder something. If someone gets enough hits summoning their possession spirit, can they add materialization as well as one of the 'extra powers'? I'm just not real clear on just how exclusive those things are.

Not by Missions rules. There's a short-list of optional powers in the books available to each spirit.

[blackangel]

A bit excessive i think. If you use this you can't possess a guard during a run...

[Tsuarok]

I gladly welcome to think that they are able to interact only with enchanted items or with beings that have living aura.

I'd been thinking of just running with the house rule of only allowing prepped vessels for any possession.  Seems too disruptive otherwise.

Wow... congratulations, you just made Possession Spirits almost totally useless in one fell swoop.

Remember, Possession Spirits can't materialize independently. That means, if they're limited to prepared vessels, then they have no way to pop in by surprise and start wrecking drek up... something Materialization Spirits can do any time, any place without needing any type of vessel.

I know, but while they are less likely to be a surprise, their attributes will be better.  As is, possession spirits can take out a guard just by possession, and use the poor sap to take out his friends without the magician ever setting foot in the area.  idk, I'll see how it goes.  If I notice materialized spirits causing much more damage I'll reexamine possession.

[All4BigGuns]

You made me wonder something. If someone gets enough hits summoning their possession spirit, can they add materialization as well as one of the 'extra powers'? I'm just not real clear on just how exclusive those things are.

Not by Missions rules. There's a short-list of optional powers in the books available to each spirit.

Don't the Missions rules disallow possession traditions anyway--at least for 'official' games?

[Sichr]

A bit excessive i think. If you use this you can't possess a guard during a run...

In my games, Guard would be easy to posess, since it is living entity and has its own aura. But not the sentry gun, which is remote controlled hitech drone...
Note the first three words...this aint meant to be flame war against peaople who are always right. This is what I offer as a solution which works most times at my table...

[Blue_Lion]

As described in vessel preparation, GM may want you to say exactly what part of the drone spirit is posessing, since whole drone is quite complex and hitech item.
I, for myself, would disallow this completely at my table, since every gear, whell, wing or engine part is is controled electronicaly and as such spirit has no chance to influence the movement of the drone, even if it is on its own, meaning Autopilot X Spirit situation. as most spirits has only 2IP in physical world, and every jumped in rigger or autopilot has 3IP, it is apparent for me, that spirit wont be able to manage override commands given by control systems.
Since there is only 1 driving action possible for each character, who will be allowed to effectively command the drone?
1. IP: Spirit tries to move left
2. IP: Autopilot overrides it
3. IP: Only autopilot is able to act

The Autopilot whould not over ride the spirt, it whould be like a metahuman mind in a possesed  host able to record but the spirt has full magical control of the drone. No commands not from the spirt can move the drone unless you give the drone a metta magic feat.

[Sichr]

ee. Drone is controled via electric control peripherals. Spirit has no controll over those. So its like an armwrestling most time.
Hehe
Electric engine moves rotor in the turbine of LS Dalmatian (vectored thrust drone)
Spirit posess the drone and begin to wrestle over the controlls
Jumped in rigger turns off the engine
Spirit doesnt have Fly power, or spell
What happens:
a) Spirit continues to spin the rotor so drone continues to fly.
b) Drone falls down.

[blackangel]

A bit excessive i think. If you use this you can't possess a guard during a run...

In my games, Guard would be easy to posess, since it is living entity and has its own aura. But not the sentry gun, which is remote controlled hitech drone...
Note the first three words...this aint meant to be flame war against peaople who are always right. This is what I offer as a solution which works most times at my table...

Well said like this I have no problems with it. But I understood from what follow that you need vessel preparation even for living creatures and that's why I react 

I gladly welcome to think that they are able to interact only with enchanted items or with beings that have living aura.

I'd been thinking of just running with the house rule of only allowing prepped vessels for any possession.  Seems too disruptive otherwise.

[Sichr]

....
Well said like this I have no problems with it. But I understood from what follow that you need vessel preparation even for living creatures and that's why I react 
....

ee. Vessel preparation only gives possessing Spirit +6 dices for attempt

The spirit makes an Opposed Test pitting its
Force x 2 against the vessel’s Intuition + Willpower Test (for
living vessels). For inanimate vessels, the spirit makes a Force
x 2 (vessel’s Object Resistance) Test. Apply a +6 dice pool
bonus to the spirit if the vessel has been previously prepared
(see  Vessel Preparation, p. 86).

IMO for the security drone/vehicle I could easily see thresshold 7, Military 9, due to interval of thresshold increase in Object resistance table

[blackangel]

In fact I like the precision upon a spirit domain in previous edition. I don't see it clealry nowadays.

To possess a weapon it seems obvious to me that your spirit must use a skill appropriate for the weapon or it's useless... Saying that, it left guardian spirit for most of them or its useless.
For a car it limits the choice to task spirit, even though I'm not sure physical or technical skills to be relevant for vehicule skills. Otherwise having a car spirit moving at the speed of the spirit can be not so bad if it has the movement power, otherwise... 

A solution could be to have an "enginered or cybernetical" spirit with specific rules but I think that we would be narrowing sprites this way... 

[Blue_Lion]

In fact I like the precision upon a spirit domain in previous edition. I don't see it clealry nowadays.

To possess a weapon it seems obvious to me that your spirit must use a skill appropriate for the weapon or it's useless... Saying that, it left guardian spirit for most of them or its useless.
For a car it limits the choice to task spirit, even though I'm not sure physical or technical skills to be relevant for vehicule skills. Otherwise having a car spirit moving at the speed of the spirit can be not so bad if it has the movement power, otherwise... 

A solution could be to have an "enginered or cybernetical" spirit with specific rules but I think that we would be narrowing sprites this way... 

Actualy the spirts skill has nothing to do with it using its new boady. It does not pilot the car it is the car and moves normaly, not operating it the way a normal person does.
Think about it what is the skill to use your body there is not one, you are over thinking it and nerfing the crap out of it.  The spirt has no clue how its body works unless it has the right skill but do you need to know how your body works to walk around?

[Sichr]

Good thing is, that while this discussion may continue for another month and we still wont know correct answer, such topics do not emerge during the actual game too often...in that case it would be reason to play a different game than Shadowrun IMO.
And when at the table, it is solved in a few soconds by GMs decision and the world goes on. Good that I have players who respect and accept my decisions in such matter and we never had to dispute about rules for more than a few minutes.
When I say No, they find another way. And when they are creative and the idea itself is fun, I still may allow a few things beyond the description of rules. Actally...I hated rele lawyers before I begin to post on Forums and find out that there is lot of details that I missed  not that I become rules bitch now... at least I hope

In fact I like the precision upon a spirit domain in previous edition. I don't see it clealry nowadays.

To possess a weapon it seems obvious to me that your spirit must use a skill appropriate for the weapon or it's useless... Saying that, it left guardian spirit for most of them or its useless.
For a car it limits the choice to task spirit, even though I'm not sure physical or technical skills to be relevant for vehicule skills. Otherwise having a car spirit moving at the speed of the spirit can be not so bad if it has the movement power, otherwise... 

A solution could be to have an "enginered or cybernetical" spirit with specific rules but I think that we would be narrowing sprites this way... 

Actualy the spirts skill has nothing to do with it using its new boady. It does not pilot the car it is the car and moves normaly, not operating it the way a normal person does.
Think about it what is the skill to use your body there is not one, you are over thinking it and nerfing the crap out of it.  The spirt has no clue how its body works unless it has the right skill but do you need to know how your body works to walk around?

This is easy when spirit posess living vessel: mind is set to helplessly witness the spirits action, without any chance to afect its own body. Like watching the SIM.
Well, I cannot imagine this happening to remotely controled rigger, since rigger is not posessed and nothing defends him from controling the drone while jumped in.