QuinnHarlech
Explorer
Jhaelen said:That's actually an official rule change as of MM4. Both it and MM5 (page 7, Lore) state that the Knowledge DCs should be (generally) based on CR.
Just to be pedantic, it's a change in the rules for MM4 and Dragon Magic, but not a retroactive change or a change for home-brew monsters. I'm afraid I can't comment on MM5 since I don't have it. Those two books change the knowledge DCs for monsters listed in them, but still quote the rule of DC=10+HD (see MM4 p. 6). Checking with (the admittedly unreliable) Customer Service says that they have not changed the rules but the new DCs aren't errors. Take that as you will. I personally like the new DCs, but really would like them to update the rule and adjust the old ones, too.