In the case of prisoner....
I would assume the health of the prisoner would affect the their ability to teleport. Also, I would assume the person may need to know where they are currently located... basically able to 'locate the stream' to take them home. The Titan MSQ revealed a few things about teleporting Pre and post the fight, mostly you need to know both start and finish locations to succeed. (Not to mention warded cells to cut off the aether of the prisoner from the outside world to prevent teleporting or scrying for the missing person) Also, highly unstable aetheric areas would make it risky at best to try to tap into the stream. (Hence why you can't teleport into trouble such as last bosses.)
The RETURN spell, however, I think is a beast of a different color. It seems more of a OOC mechanic for the game.
When Grave uses teleportation it normally involves tapping to the aether and mapping out a route, given he has the time he can carefully map out how he wants to go about doing it and not cost much to his person. In a rush I have him suffer consequences... from sickness to disruptions that could attract creatures from the void finding a weak spot between the worlds and piercing the veil.
If we want to turn it into a pure IC thing. "Return" would be more... of a VERY common place your character teleports to so it is like... driving while half asleep to work (don't do this)... you have such a memory you can pull it off as long as you are on the right route, so it may not work as well if you are in unfamiliar areas. Similarly, the more expensive the 'route' indicates the further in the stream you must travel indicating a more exhausting and perhaps more dangerous teleport.
Edit: It should also be noted return only works for Cities (well... I think), so we may be able to assume the Aetherytes there have some EXCEPTIONAL quality that allows them to shine like major cities at night in space. Easier to find, easier to get to and given enough practice if you know what you are doing... little effort for aethericly inclined individuals. (aka cost 0 return)
I would assume the health of the prisoner would affect the their ability to teleport. Also, I would assume the person may need to know where they are currently located... basically able to 'locate the stream' to take them home. The Titan MSQ revealed a few things about teleporting Pre and post the fight, mostly you need to know both start and finish locations to succeed. (Not to mention warded cells to cut off the aether of the prisoner from the outside world to prevent teleporting or scrying for the missing person) Also, highly unstable aetheric areas would make it risky at best to try to tap into the stream. (Hence why you can't teleport into trouble such as last bosses.)
The RETURN spell, however, I think is a beast of a different color. It seems more of a OOC mechanic for the game.
When Grave uses teleportation it normally involves tapping to the aether and mapping out a route, given he has the time he can carefully map out how he wants to go about doing it and not cost much to his person. In a rush I have him suffer consequences... from sickness to disruptions that could attract creatures from the void finding a weak spot between the worlds and piercing the veil.
If we want to turn it into a pure IC thing. "Return" would be more... of a VERY common place your character teleports to so it is like... driving while half asleep to work (don't do this)... you have such a memory you can pull it off as long as you are on the right route, so it may not work as well if you are in unfamiliar areas. Similarly, the more expensive the 'route' indicates the further in the stream you must travel indicating a more exhausting and perhaps more dangerous teleport.
Edit: It should also be noted return only works for Cities (well... I think), so we may be able to assume the Aetherytes there have some EXCEPTIONAL quality that allows them to shine like major cities at night in space. Easier to find, easier to get to and given enough practice if you know what you are doing... little effort for aethericly inclined individuals. (aka cost 0 return)
