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Message: <blockquote data-quote="frankthedm" data-source="post: 3324020" data-attributes="member: 1164"><a href="http://wizards.com/default.asp?x=dnd/tt/20060905a" target="_blank">http://wizards.com/default.asp?x=dnd/tt/20060905a</a><a href="http://wizards.com/default.asp?x=dnd/arch/tt" target="_blank">http://wizards.com/default.asp?x=dnd/arch/tt</a>A Peek Behind the Rules CurtainSo how do designers determine the Difficulty Class for Knowledge checks about creatures? The following is excerpted from Monster Manual IV:The description of the Knowledge skill indicates that in general, the baseline DC of checks to identify monsters and remember one bit of useful information about their special powers or vulnerabilities is equal to 10 + the monster's HD. Every 5 points by which the check result exceeds the DC yields another useful piece of information (PH 78).As a general rule of thumb, a DC 15 check or higher will reveal all of the base creature's type and subtype traits as defined in the glossary. This often includes information about energy resistance or various immunities. For instance, a DC 15 Knowledge (arcana) check reveals that dragons have high hit points (12-sided HD), all good saves, and have darkvision out to 60 feet and low-light vision. They eat, sleep, and breathe.Information specific to the creature, such as its type of damage resistance, spell-like abilities, or immunities come with the high DC check results.</blockquote>