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Message: <blockquote data-quote="Destil" data-source="post: 672126" data-attributes="member: 1980">By this logic the fact that thretened area and flanking section in PH 122 would mean that flanking won't work in 3D, while it's stated in the aerial combat section that it does. Or you wouldn't be able to cast a spell like hold person on anything but a creatues on a flat plane around you since there's no rules stating that the range listings work in the third dimention. In general the rules are stated with reguard to 2D, but that's just because most combats don't take place in 3D. Clearly once this becomes an issue things don't change much, you just need to consider the complexity the third dimention adds.3D does have a minor issue that most creatures are taller than 5', making 5' cubes a bit problematic to work with.  But in general you would extend a creatures 5' reach out into 27 (or 36, if you want to deal with the height descrepenicy) 5' cubes around a creature. A shield spell would be a plane that blocks off 9 cubes (one edge) from where you are, and anything that needs to travel through thoes cubes. So it could block off everything above you, below you, at a 45 degree angle from the ground, or even at some odd arc. For sanity I think I'd restrict it to 45 degree angles, myself.</blockquote>