Hunter-Killer

A single monster derived from discussion in the purple server, because my brain is a fog of nothing interesting at the moment.

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Hunter-Killers are large (like 8 foot long) weasels, about as strong as a bear. They are so-named because lords, merchants, criminals, and other worthies sometimes train them as attack and hunting animals. They are infamously good at getting into houses, castles, and strongholds thought secure, where their ferocity will make short work of unready foes. They are not intelligent in any general sense, but they can be sicced on enemies, or released in a feral state to tear whatever they find to pieces. 

Hunter-Killer

HD3, unarmoured, bite (d8!, crit range +1), speed 3x human, disposition in the wild: territorial predator, will retreat if seriously wounded, unless you are a threat to its young. Disposition if trained: attack dog, will keep biting until it is killed. 

Hunter-Killers have sharp, hard, ripping canines, powerful jaws, and instinctually attack weak points like the throat and groin. A Hunter Killer's bite attack damage explodes on maximum damage roles. 

A Hunter-Killer can fit through any gap the size of its head, which is about the size of a human's. They move completely silently, and can smell living prey within 50ft, and blood within 200ft. 

Once they have subdued or killed something they usually drink the blood from the corpse, leaving horrible, drained cadavers that will betray their presence to anyone familiar with them. 

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Significantly informed by the way, way scarier version made from the corpses of dismembered teenagers in this (excellent) book.