I heard somewhere that Neoptolemus' creature mod, 'The Undead', is available as a modder's resource. I've tried to email him through PES, but it's been a few weeks and I haven't got a reply. The read me also doesn't say whether it is or it isn't. Does anyone know about this?

Directly from the ReadMe:

PERMISSIONS:Feel free to use these meshes in your own mods. Just credit the originalauthors. 

So go ahead and use the creatures, just be sure to credit the modders. Your best bet would be to just include the original Undead ReadMe with your mod, since a lot of people's work is in this mod.

I am a saver of old WIP threads, so I checked through my files. Here is a quote from his 3.0 WIP thread:

"These will appear in regular tombs, and occasionally in exteriors at night. But they are a modders resource, so you can all go wild making special dungeons for them if you like."

Lol. I guess I must have totally overlooked those. Thanks.