Taken from the publisher blurb:
Dwelling in the crawl spaces and rubble covered heaps of the Old Ones, live cunning man eaters known as Bog-Billies. Although slow in the open street or swampland trail, they are often much faster than a humanoid excavator who, on his or her hands and knees, has fallen for the bait, and foolishly crept into the ambush of these foul mutants.
Also called Floor Devils and Nailbiters, these disturbing looking, distant human off shoots are the 5th in The Mutant Epoch RPG’s free line of Creatures of the Apocalypse.
This 7 page document includes a close up player handout version as well as a highly useful old school blue inked ruin map showing a typical Bog-Billy lair denoting baiting points, tunnels, and bone and relic filled larders where captive PCs are taken to await their grisly fate. This foul mutant’s description also includes a ‘bait item’ treasure table and rich selection of mutations to make them extra nasty.