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If you fail your save against a web spell you gain the grappled condition.
Web creates a many-layered mass of strong, sticky strands. These strands trap those caught in them. The strands are similar to spiderwebs but far larger and tougher. These masses must be anchored to two or more solid and diametrically opposed points or else the web collapses upon itself and disappears. Creatures caught within a web become grappled by the sticky fibers. Attacking a creature in a web doesn't cause you to become grappled.
Anyone in the effect's area when the spell is cast must make a Reflex save. If this save succeeds, the creature is inside the web but is otherwise unaffected. If the save fails, the creature gains the grappled condition, but can break free by making a combat maneuver check or Escape Artist check as a standard action against the DC of this spell. The entire area of the web is considered difficult terrain. Anyone moving through the webs must make a combat maneuver check or Escape Artist check as part of their move action, with a DC equal to the spell's DC. Creatures that fail lose their movement and become grappled in the first square of webbing that they enter.
If you have at least 5 feet of web between you and an opponent, it provides cover. If you have at least 20 feet of web between you, it provides total cover.
The strands of a web spell are flammable. A flaming weapon can slash them away as easily as a hand brushes away cobwebs. Any fire can set the webs alight and burn away one 5-foot square in 1 round. All creatures within flaming webs take 2d4 points of fire damage from the flames.
Web can be made permanent with a permanency spell. A permanent web that is damaged (but not destroyed) regrows in 10 minutes.
If you are grappled and trying to cast you have to make a concentration check.
PRD:Grappled or pinned while casting-----10 + grappler's CMB + spell level.
The problem is that web does not have a CMB only a DC to break the grapple or am I missing something.
The situation was that a caster was trying to cast call lightening which is a full round action. That gave me time to cast web so I could hopefully force him to drop the spell. He failed the save, which is when I noticed it had no CMB or at least not one I could find, nor anyone else at the table.
edit:fixed misplaced bbcode
This has been brought up before. I don't recall seeing a satisfactory answer, much less an official one.
A lot of spells that use the grapple mechanic have this kind of rules gap in them.
FAQ'd.
Actually, there is a pretty simple way to figure this out. The CMD of the web is equal to the save DC. Since CMD = CMB + Dex + 10 (in most instances) you can reverse engineer the CMB from that. (NOTE: This is not direct RAW, but is gathered from RAW as best as I can compile it.)
Web is a stationary object and thus has a -5 dexterity modifier. We also know that a spell's save DC equals 10 + casting stat modifier + spell level. So, using a little algebra we know that:
10 + casting stat mod + spell level = 10 + CMB + dex mod
...which reduces to:
casting stat mod + spell level +5 = CMB
Assuming you have a wizard with an Int mod of +5 and knowing that web is a second level spell you get your web-grappled caster needing to make a concentration check against a DC 24 (10 + Int mod + spell level + spell level +5, 10+5+2+2+5).
You lost me, Mauril.
Why are you adding spell level twice?
I am pretty sure taking a guess at reverse engineering is not what they intended for us to do. I think it was just overlooked. Hopefully they fix it though.