James Jacobs
Creative Director
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For things like this, the DCs by level table on page 53 of the GM Core is your best friend (can't remember off the top of my head the page number it appears on in the OGL version of the book, but it's the same numbers). This level is set up for 9th level PCs, so the standard DC there is DC 26, so that's a safe number to use for any spur-of-the-moment DC you might need during that level's exploration, including something like this where a DC appears to be missing from the text.