While the mineshaft monsters did survive the fall of industrial island, none of them dared enter the remains of industrial island in fear of what might happen to them, except the trat, who's armor was just enough to survive the goo of goo island without getting mutated like the other monsters. Since trat is the only monster on goo island with knowledge of what the monster world was like before goo island, many of the monsters look up to him and ask him to tell them stories of how the monster world was like before the goopocalypse. Trat has assumed his new role of co care taker along with the many other higher ranked monsters of goo island. To whom those monsters may be, well, you'll just have to wait and see...
