Need undead fodder

[JOHNB83]

I'm running a campaign in which my players are about to enter a massive tomb fill with undead. The ACL of the group is 12-13 what are some good undead to throw at them in masses that wont be a simple wipe for them, but so tough that the mook mosters will destory them. Also if any you has a favorite undead cr 10-13 let me know as I'll need to sprinkle some tougher battles in to.

[boring7]

You can throw nothing but ghouls, ghasts, and similar weak critters at the PCs. You can use skeletal champions who are determined by class level. But the true flavor of an "endless wave of walking corpses, mindlessly tromping towards you" is zombies and skeletons.

Hey check it out, we have the swarm template which lets you turn a pile of 2- hit die monsters into a rolling wave of decent challenge. Or the troop template which is basically the same thing but better built around humanoids.