To help me understand your query better, could you please provide more context?
For example:
* What source is this from? Is it a specific book, game, film, or other work?
* What is the setting of Turnback Cave? Is it a real cave, a fictional location, or something else entirely?
* What other details are there about the Pillars? Do they have any specific characteristics or purpose?
With more information, I can try to help you decipher the meaning of the Pillars.