I think, a lot of creatures and some of the more dark gods in D&D are influenced by the Cthulhu Mythos. Don't you meet fishpeople in BG 3 (I'm not there yet, but saw pictures)? The look a lot like the Deep Ones.
The Mindflayers are obvious too. I have to go through the monster manual again, but I'm sure, I will find a lot of other similarities.

Last edited by fylimar; 27/12/20 09:47 AM.
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