Awfully powerful. I would hesitate to give it to one my PCs because they could then make anything: money, magic swords, potions of resurrection, ???
But it would be good as a quest item, where the PCs have to go to the cave/mountaintop/? to get an item that they need. Perhaps have the PCs have to pay with exp.points or some such thing. I think I'll put it into my world that way. Go to Comment
Short and sweet. Makes me want to map out an incredibly complex portal trap dungeon of some mad spacial warping abomination. Hm. Possibly some sort of giant flying lizard that craps alternating recursive portals everywhere.
Guide: "Don't step in that!"
Hero 1: "Ew, some sort of-" *Disappears*
Hero 2: "Where did he go?"
Guide: *Points up*
Hero 1: *Falling from a excrement portal on the ceiling"
"AAAAAH! WAAAAARP POOOOO!" Go to Comment
Actually, two linked portals can be placed below each other. The lower one covers a shallow pit with something desirable. Once you go in, you fall - from the upper portal into the lower one, and again and again and again... until you are rescued, or die. Go to Comment
Another possibility is that the trap is already filled with projectiles loosed by previous victims of the trap- a whirling river of arrows, bolts and magic still hurtling down the passage. Go to Comment
A levitate, fly or similar effect, magic or psionic, could get you out of the process of constant falling.
Plus, I'd see the dungeon "owner" needing to maintain the trap to keep it free of debris and mice and other stuff (read corpses). Alternatively, the magic of the portals could just teleport stuff somewhere else after some time of falling. Go to Comment
I don't know about this. Unless the portals add some sort of "push" to an object when it exits, most normal projectiles will eventually slow down and stop. Even magic projectiles might fissle out, given enough time, and some of those (ie fireballs) are probably subject to the same air friction as normal missiles anyway.
The "one over, one under" configuration would still work like this, though. Go to Comment