Editing Underground Polis (section)

===== The Slime =====

A sickly yellow slime mold that sometimes starts to spread out from the neglected tunnels beyond the City's west wall, like a sudden fungal tide, known to cover at worst maybe a quarter mile per day. Brief exposure only causes a mild burning sensation, but people caught unaware by it (typically people sleeping in or under the streets) have sometimes been found ''digested'' to the bone; on some particularly disastrous occasions the slime has grown under and up into houses and entire neighborhoods before being noticed, with tragic consequences. Fortunately, burning and shoveling it back have always been sufficient to check its advance, and it usually only happens once a decade or three.

There's probably some significance to the way it spreads out from the direction of the old graveyard, just outside the walls, but everybody has a different theory on what this means (aside from the Pits usually getting the worst of it). Nobody's volunteered to go and explore - aside from that one brave squad, as the elder guardsmen are happy to tell, that never returned. You never met them, it was before your time.