RAISE YOUR HAND IF YOU'RE GUILTY OF WRITING WORLDBUILDING THAT IN-UNIVERSE NO ONE WOULD REMEMBER, HAS NO BEARING ON THE PLOT AND WILL NEVER BE MENTIONED SO READERS WON'T KNOW ANYWAY. I DO THIS MORE OFTEN THAN I SHOULD.
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You had me at "comes from horrible eldritch things".
And I highly recommend the Discworld series, especially the audiobooks. It's quite irreverent about dozens of fantasy and scifi tropes, but it's so damn brilliantly written that it's my favorite series of all time. Sir Pratchett's gift for metaphor is unrivaled.