The Elder Evils assault the multiverse in strange and calamitous ways. Sometimes they breach the Material Plane by exploiting the unfathomable energy and darkness found in the world’s depths. These terrestrial manifestations of loathsome alien agendas are known as core spawn, and they are as varied in their physiology as they are horrific.
Their concentration in the desolate lands of Blightshore makes the core spawn a challenge to research, and many who have sought to observe or study these nightmarish entities rarely return. Those who do return are often shells of their former selves who speak of horrifying underground labyrinths of twisting caverns and malevolent nests where other denizens of the Miskath Strand are dragged below to some infernal purpose.