Not sure if there is already a place to post this sort of issue. please let me know if their is. So I was inputting some monster stats into my campaign using the compendium when I noticed something strange about the Skeleton, in the compendium it has immunity to the poisoned, but no immunity to poison or exhaustion, which most undead do have, a quick check through my Monster Manual shows that it does have those features (It's also inside the standard SRD). I hope this isn't too big of an issue to fix, I haven't seen any other mistakes, but will try and keep you informed if I find any more.