The Nosferatu template seems to break the Universal Monster Rules on Blood Drain. It specifies that it drains Constitution and Wisdom on a successful grapple attack. Nowhere in its entry does it indicate that this drain is actually Constitution and Wisdom damage instead of Constitution and Wisdom drain.
So, based on the Universal Monster Rule that Blood Drain actually does Constitution damage, should I treat the Nosferatu's Blood Drain as doing Constitution and Wisdom damage, instead of Con and Wis drain?
Or is the Nosferatu template actually dealing Con and Wis drain on a successful grapple? The Nosferatu template doesn't inflict negative levels so having it deal drain instead of damage might be how it compensates.
Abilities do what they say they do. In some cases they override the general rule. This is fine, and intended.
There's quite a few examples of this in the ruleset. "Specific trumps general" is one of the unwritten rules of the game.
And not one of the dumb ones like "metaphorical hands".