| Thanks for a detailed opinion %) although seems like you're the only person who likes the mixed layout of flavor and statistics blocks. With the next monster I'll try to place them less chaotically, to justify them around borders...
You're right about undead immunities and nightmares' effect on magic, I should've mention that - and I will when I'll develop good design for all this. "FF" and "T" are "flat-footed AC" and "touch AC". Too bad these abbreviations are not that well known as I thought they are :\
Yeah, the monster and its abilities are not mine, although I adjusted some traits (converted from 3.0 and stuff). The thought that it would be hard to hook PCs for a targeted hunt crossed my mind. I think the villain might use some sort of blood-collecting creature for that - a strige or a vampire bat...
* recalls the scene from the Hunk comics when a swarm of mechanical rats was sent get at least a drop of his blood. The battle during a storm night was quite epic.
I used this creature once, with the EL 2 scenario. The hound was just shot for some chunks of flesh and went on its way. So, I don't know yet if it's balanced or not... But - your suggestions how to fine-tune it look great and adventure-oriented %) | 
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