darthspader wrote:
Once i cast the spell does the target I want to possess need to be within line of sight? Or just within range, say in another room of the dungeon?
Not quite. You need line of effect from the jar to the target (you can't 'see' from the jar, technically). This means that the target can't be in another room (unless you have line of effect to it, like through an open door), on the other side of a wall, or even standing behind an invisible gelatinous cube (which does fill its space).
Note that you do not need line of sight or line of effect to the 'jar' when you cast the spell, as long as you know where it is within the spells range. Also note, that the spell's range and its possession range are not the same (the spell's range is about 100 feet longer).
Magic Jar; 2nd paragraph wrote:
While in the magic jar, you can sense and attack any life force within 10 feet per caster level (and on the same plane of existence). You do need line of effect from the jar to the creatures.
Quote:
Once the spell is cast, can my party take my body and place it, along with the jar inside a secure location, such as inside a rope trick, or a secure cottage, that kind of thing? Would doing so end the spell or inadvertently kill me?
Your party can do anything they like to your body, even incinerate or disintegrate it and it has no effect on you at all unless you end the spell (or it ends). At that point, you die. Destroying the gem/jar will end the spell, and return you to your body (which will result in death if it's also been destroyed or is out of range).
They can carry it a million miles away or even to another plane and it only matter when your spirit tries to return to it, at which point if you are not within the spell's range of your body (from the host or the jar, depending on your location) then you die.
The same is true if you move your host body away from the jar and you somehow get it killed. Otherwise, your body or jar's location is of no consequence except when you are returning to one of them
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Could they cast reduce person on my body and store it, along with the jar inside a bag of holding? Would that kill me or end the spell?
Yes. They can make it invisible, they can polymorph it into a mule, they can dress you up as a fairy princess. As for storing your body and/or the jar in extra/nondimensional spaces... I would say that as long as your body was accessible to a spirit, then you're probably okay if the total distance to reach it was within the spell range.
For instance, there's nothing really preventing a spirit from crossing the boundary into a
rope trick, so as long as the opening was within range, you could enter. If in a
bag of holding or a
portable hole, I would say the bag or hole would have to be open and not sealed. Otherwise, like in the case of a
magnificient mansion that you couldn't enter, you would be considered out of range.
Here's some additional thoughts on magic jar from another post, just ignore the parts about black pudding from the OP's initial question.
