New answers tagged traps
An example of DnD crossing into the sci-fi is an old module. S3 - The Barrier Peaks - http://en.m.wikipedia.org/wiki/Expedition_to_the_Barrier_Peaks Perhaps this will help you form the scenario better?
It sounds like your trying to hybrid the Sphere of Annihilation. Seeing as the 4e mechanics clash with the 3.x mechanics and your choice for PK upon jumping in, it is truly up to DMD. For balance purposes, relating to 4e approach, I would go with Erik's source: Touching resulting being pulled in. This way, should they stick an item in to test the depths ...
It's a sphere of annihilation. It annihilates. If they touch it, they're gone. You can house rule it any way you'd like, but historically that's how it works.
Since this is essentially now an item that you made yourself, the answer to what happens logically can also only be "Whatever you want to happen." There are no rules in 4e for losing limbs or such things, and there are no Save vs Death effects either, so you're pretty deep in house rule territory already.
Take a look at the Eberron Campaign Setting Eberron explores the corollary of Clarke's third law (any sufficiently advanced technology is indistinguishable from magic) - that is to say it asserts that sufficiently advanced magic is indistinguishable from technology. It has a rich story that you can repurpose large swaths of. Reflavor things, simply A ...
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