Klaus said:
So what can you tell me about the Skyrr (the weird bull-skull-headed mummy thing) and the Bleakborn?
The Skirr looks very cool, but just what it is is not really explained. It just says it is a predatory undead that enjoys aerial tactics. Since it doesn't seem to resemble any living creature, and the picture seems to suggest to me that it is constructed from the corpses of several bound together, here is what I'd say:
Skirrs are somewhat of a cross between a construct and an undead. A necromancer must gather the head of a Dire Bull, the wings of a dragon, and the body of a sphinx. Then, the pieces are assembled, bound in mummified wrappings, and finally animated as a Skirr.
Bleakborn are humanoids that died by freezing to death. They hunger for, and drain, warmth from living things. They radiate intense cold, and are actually healed by fire and other heat sources (a nasty surprise for a wizard who thinks "cold creature = hit it with fire".) Any killed by their heat-drain becomes another Bleakborn, and anyone killed by a Bleakborn in another way (its slam attack, for instance) becomes a normal zombie. Pretty cool creature, if you'll pardon the pun

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And what's a Slaughter Wight and how is it different from a Wight?
They are simply a tougher form of Wight, "touched by the power of dark gods", the book says. They spawn normal wights from the bodies of those they kill, and are sort of a "Wight King". At 18 hd, with Energy Draining and specially augmented critical hits, they are tough customers...