There is also another hole in the deserts of Dregar by the silver caves. If these two are somehow linked, then the spider-like creatures exist in both.
This is the same story as the one with the dark creatures. There are other writings on this that detail the story.
Extreme caution should be taken when entering this hole, as no creature dark or light enjoys meddling adventurers.
Sincerely,
Amaris A'Iretni