Dear List,

 

How would you explain the clause bracketed clause in the following sentence?

 

    Some in this group are so ardent [that they avoid the campgrounds of the masses.]

   

Does the clause start at so? Or does it modify ardent?

 

It seems like a very common type, but it doesn't seem to fit the normal pattern of a noun clause, an adjective clause, or an adverb clause. 

 

Thanks,

 

Scott Woods