Casting in a Web

[Yrtalien]

Being caught in a web spell gives you the grappled condition. the grappled condition says the following:

A grappled character who attempts to cast
a spell must make a concentration check (DC 10 + grappler’s
CMB + spell level, see page 206), or lose the spell. Grappled
creatures cannot make attacks of opportunity.

What is a Webs CMB?

Should I use the DC of the spell?

Thanks in advance

[Zairos]

Since the Web "CMD" is equal to the DC of the spell, I'd do this:

CMD = 10+BAB+Str+Dex = DC = 10+Spell level+Int+Other modifiers

So, I'd say that BAB = Spell level, Str = Int, Dex = Other modifiers. This leads us to:

CMB = Spell level+Int.

Of course, none of it can be inferred from the RAW, but I think it's a good "logic".

[Treantmonk]

Yes, you use the DC of the spell as the Web's CMB when attempting to break the grapple, so would use it when attempting to cast as well.

[Asgetrion]

Treantmonk wrote:

Yes, you use the DC of the spell as the Web's CMB when attempting to break the grapple, so would use it when attempting to cast as well.

Exactly; I had this very situation in yesterday's session.

[Zairos]

Treantmonk wrote:

Yes, you use the DC of the spell as the Web's CMB when attempting to break the grapple, so would use it when attempting to cast as well.

You actually use the DC of the spell as the Web's CMD (not CMB)...

[The Grandfather]

Zairos wrote:

Treantmonk wrote:

Yes, you use the DC of the spell as the Web's CMB when attempting to break the grapple, so would use it when attempting to cast as well.

You actually use the DC of the spell as the Web's CMD (not CMB)...

It is true that the web's DC is like a CMD rather than a CMB.

Thus the concentration check would be DC 10+2(lvl of web)+web caster's Int mod.+ lvl of the spell being cast.

Which is actually the "Affected by a non-damaging spell while casting" check = DC of the spell + spell level of the spell being cast.

[JohnnyR]

Yrtalien wrote:

Being caught in a web spell gives you the grappled condition. the grappled condition says the following:

A grappled character who attempts to cast
a spell must make a concentration check (DC 10 + grappler’s
CMB + spell level, see page 206), or lose the spell. Grappled
creatures cannot make attacks of opportunity.

What is a Webs CMB?

Should I use the DC of the spell?

Thanks in advance

According to https://www.d20pfsrd.com/Magic/#TOC-Concentration

If the spell interferes with you or distracts you in some other way, the DC is the spell’s saving throw DC + the level of the spell you’re casting.

and there is a specific rule for entagled on the same page:
Entangled
If you want to cast a spell while entangled in a net or by a tanglefoot bag or while you’re affected by a spell with similar effects, you must make a concentration check to cast the spell (DC 15 + the level of the spell you’re casting). You lose the spell if you fail.