In 957 GUE, the demon Jeearr's plot for conquering the world involved manufacturing an army of millions of light-resistant grues beneath Egreth Castle using infernal machines conveniently provided by the Frobozz Magic Mutated Grue Breeder Company. Luckily for mankind, these mutated grues were never released into the world at large. These mutated grues were not bothered by light in the least, not even by powerful FROTZed spells.