Nothing can surpass morrowind, given vvardenfell is a canonical racism island you're just dropped into and not expected to ever "fix"
Gonna be real, if you want to come up with a slur for your fictional world, you have to tap into your inner-bigot, no matter how progressive or woke you are, try to think like one. Otherwise, you get stupid terms like "ash maker" that sound cool af instead of derogatory.