Spiders Keep Secrets.
Photo by Opo Terser via villageofjoy.com
No, I know; you thought "web of intrigue" was just a neat catchphrase. But every time a secret is born, a spider emerges from the shadows. It bears the secret, holds on to it, nurtures it and draws strength from it.
When a spider is killed, the secret is lost. If it is destroyed in a single strike, someone, somewhere, gains the knowledge of the secret that it bore. If it is consumed, the being that consumed it will learn its secret. Portions of a dead spider's secret may be recovered and extracted from the pieces of spider that are not obliterated; a shoe striking a small house spider is likely to wipe out most of the secret - if one is lucky, the words "Fahd, the bak-" might be extracted from the legs that were not crushed. On the other hand, giant spiders slain by murderous rovers armed with pointed, and not crushing, weapons might be able to recover more details. And it is often said that the scope of the spider matches the scope of the secret...
The nature of the spider is rumored to have some relation to the type of secret that it bears. Jumping spiders bear secrets of individuals, while those that spin webs bear secrets that touch upon multiple parties. Sages have debated the significance of the number of strands or the size of the web, but no conclusions have been reached.
|"Queen of the Demonweb Pits," Justin Gerard|
This entire discussion has obvious relevance for some traditional D&D groups, particularly those that might, for instance, have societies based around spiders and place a high premium upon noble intrigues.
In such societies it is considered taboo to harm a spider. Rather than a piece of vanity on the part of a Spider Goddess, however, this is practical advice in the great game of the noble houses. Destroying a spider means that the secret is lost; seducing a spider means that you might be able to convince it to give up its secret. Of course, you'd have to give it a new one in exchange - namely, another spider for it to devour. Gifts of spiders between noble houses are not uncommon - in some cases, they are the secrets of others, traded back and forth, while in others they are secrets of one house being given as a sign of good faith.
Also, given both this post and Zak's post linked above, the Spider-tailed Adder, whose tail mimics the motion of a spider to attract prey, raises some tantalizing issues... (h/t to Jensen for this one)