What is the CMB of a Web Spell?


Rules Questions

Grand Lodge

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Since Web grapples and no longer Entangles, there's been one weird oversight.

A creature that tries to attempt to cast a spell while grappled must make a Concentration check of DC 10+Grappler's CMB+Spell Level.

But Web doesn't seem to have a CMB, as far as I can tell.

So does that mean a person grappled in Web trying to cast a spell just makes a Concentration check of DC 10 + 0 + Spell Level? Seems kinda weird that web has no CMB.


Quote:
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.

It seems that the DC of the spell equals CMB

If so then a Concentration check of 10 + DC of the spell(web) + Spell Level of spell being cast by the grappled caster is correct.


You can escape being grappled by making a combat maneuver check against the spell's DC. This would essentially mean that the spell's DC is the same as a CMD score rather than a CMB score. Since the DC already includes a "10+" term, adding another 10+ term is probably overkill.

So I would suggest that the DC of the concentration check should be equal to the DC of the web spell plus the level of the spell you're trying to cast.


Add the +10 DC still keeps it lower than a monster of the same level as the caster, and it is there because you add 10 to the CMB, which is this case seems to be the spell DC. I do think it needs errata though so this can be more clearly stated.

As an example a wizard that starts at level 1 with a 16 in intelligence could produce a DC of 10+19+spell level at level 10.

The giant flytrap(CR 10) has a DC of 10+18+spell level. With that 10 the the spell is a let easier to cast from.

To be fair I will check level 5 also.
10+15+spell level for the wizard if he starts with in intelligence of 18.

A dire lion has a DC of 10+14+spell level.

After level 10 the monsters pull away.

Of course we also have no idea of whether or not the devs wanted the spell to compete with monsters that specialize in grappling. It is very possible that they wanted to be to a lot easier to cast while webbed.

Dark Archive

I'm a bit late, but I had the same question. Here's my thought: can we assume the web spell has a dexterity of 0 and work backwards?

In that case, if a web's CMD is say 18, then it's CMB would be 13. I have no idea if that's how it's supposed to work or not, but that made sense to me.

Sczarni

I believe that Web doesn't have any CMB. It has only CMD which is equal to the spell's DC.

The CMD is static, it's always fixed amount. Web isn't a creature that attacks but instead reacts in response of characters movement.

"A creature that tries to attempt to cast a spell while grappled must make a Concentration check of DC 10+Grappler's CMB+Spell Level." - CMB is zero in this case but I wouldn't look at this DC to cast a spell, instead I would look at DC of spell. It's written multiple times through spell descriptor "with a DC equal to the spell's DC" so I would stick to this DC simply. It might have been small oversight in writing but that on side, Web just stops movement not spell casting, so it wouldn't be unusual for DC to be 12 for casting spell (10 + 2).

Dark Archive

Technically, it doesn't say it has a CMD either. It just has a DC that acts very similar to a CMD.

But if you're right, the concentration DC would be determined by the spell the caster is trying to cast, not web. So the DC could be anywhere from 11-19.

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