The effect of the web says it is a 20 foot radius spread. If a creature is flying 15 feet above the area where the web is cast is he caught in it?
BACKGROUND: My BBEG cast web at the party. A PC said that since he was flying 15 feet above the area, he wouldn't be entangled because the web would have to be anchored to the wall as if the web is horizontal to the floor. I thought that the web would fill an area 20 feet wide and 20 feet deep. The PC's were in a 20 ft wide corridor.
If the corridor is 20' wide and 20' tall, there are diametrically opposed points available for the web spell to fill the corridor floor to ceiling in any square in the 20' radius spread.
If the corridor is infinitely wide and infinitely tall, there are no anchor points and you get something like a pile of loose webs that collapses and disappears.
If you've got something in between, you get a result somewhere in between. Consider this if there's only one wall available
X=solid wall
w=web
X|w
X|w.w.w
XL_._._._.
If there's only a corner, adjacent to the wall the web will be almost full height, but at the far right edge, it's going to be less tall. If the character were flying adjacent to the wall, I'd say he's still affected. If he were flying above the outer edge, probably not affected.
Corridor was 30 feet wide, and 80 feet tall. So the ruling should be?
There aren't any diametrically-opposed points 20 feet or less apart. The web collapses and disappears.
There aren't any diametrically-opposed points 20 feet or less apart. The web collapses and disappears.
20 ft RADIUS spread easily reaches from one side of the 30' wide corridor to the other. Webs wall-to-wall to a height of 40' (perhaps with a bit of sag in the middle).
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Web is a 20-foot radius spread. PRD link
So a 30-foot wide corridor has diametrically-opposed points all the way up. If you cast the center to be 20-feet high, and following SlimGauge's guidelines, the top of the center would hang down to about 25-feet above the floor, with the sides close to 40-feet up. You should be able to catch someone flying 15 feet up. Other circumstances may be involved.