Space Slime (CR 4)
This sticky, translucent green slime devours flesh and organic materials on contact. Wet and sticky, it clings to walls, ceilings, and floors in patches, growing and spreading as it consumes organic matter. It drops from walls and ceilings when it detects movement (and possible food) below.
A single 5-foot square of space slime deals 1d6 points of Constitution damage per round while it devours flesh. On the first round of contact, the slime can be scraped off a creature (most likely destroying the scraping device), but after that it must be frozen, burned, or cut away (dealing damage to the victim as well). Against wood or metal, space slime deals 2d6 points of damage per round, ignoring metal’s hardness but not that of wood. It does not harm stone. An injection of sporekill or 10 or more points of cold or fire damage destroys a 5-foot patch of space slime.