Castle Merciless. Home of He who dwells in nightmares.
Just off the craggy cliffs of Corundum, under the rippling blue ocean waves, seven stones stand. They rise majestically from the ocean floor, references to some long ago civilization. Meaningless, now, to all but the most learned.
There are many scret places in the old forests; the least of which is by no means Old Stone Face
A cult's theology is binding on the god involved: it is possible for that god to believe (and see, just like Winston Smith in 1984) that other gods are mythical, or jumped-up demons, or failing older spirits, even while those gods actually exist and thrive and act in the cosmos, even while working against him.