This is what happens, I always told 'em, that ol' house Mr Potter lived in is starting to smell real bad I'd say. But would they listen, oh no, they just keep blabbering on about taxes this and tribute that, nobody has time for the renovation of the beggar district. And now it's eaten Harry. Who am I going to play chess with now? Instinct: to envelop

• Expel vile gases, consume something / someone

In the filthiest gutters and the most neglected of gardens, these almost sentient piles of meat take up home. Luring scavengers such as rats and flies they envelop and consume them, steadily growing larger over time. Rarely is one found that is larger than a small dog or potted plant, but there have been reports of abandoned houses that have been overtaken by their sickly smell, hinting at the dark fate of previous occupants. Instinct: to add to its mass

• Expel vile gases
• Cause sickness in those around it

Awakened from some deep place, this monster towers over any artificial construct. Or it would, if it remained above ground for longer than a few seconds. It resembles a massive worm, its rocky body extending for over a hundred metres, with a girth greater than that of a house, and of immeasurable weight. Using its specialised mandibles and the sheer enormity of its body it propels itself through the ground at fantastic speeds, erupting from below in showers of rock and displaced earth to crash down again several hundred metres away. Instinct: to consume

• Consume mineral deposits
• Cause widespread destruction