the gruesome heaps of body parts buzzed with millions of flies , crawled with maggots and nightworms , and were frequently partaken of by the hungry denizens of phantasmagorika 's sewers , which were present upon this level in abundance , including the jackal-headed harpies and their hyena-faced cousins , the starving mutant demons with translucent skin and their bloated , bony , sickly children , and the large fungus beasts which moved slowly amongst the refuse .