Hullers

Hullers are a rare but dangerous breed of monsters found only in the remote sections of wilderness. They prefer cave systems, thickly wooded forests or similar areas that are not open and free ranging. Hullers are tall, bipedal creatures with long, rope-like arts and claws. They emit a powerful pheromone smell that has an effect on other organisms, lulling them in and inducing a state of discombobulation. 
The pheromone can travel for quite some distance, and anyone who smells it will suddenly, maybe even irresistibly, drawn towards the source of the smell. Even when presented with evidence of danger, those affected will still feel an urge to keep going (they can resist it, of course, but the urge will still be there for awhile). 
The idea behind the pheromone is simple: the Huller can simply wait for chemically intoxicated victims to come wandering into their lair. There, they can attack in small groups and tear them apart. 
Abominations and Hunter Adepts, who often have highly developed senses of smell, are immune to this power. They have together been largely responsible for hunting the Hullers down to only a dwindling population.