“At another house, where people were stirring, he asked questions about the gods, and whether they danced often upon Lerion; but the farmer and his wife would only make the Elder Sign and tell him the way to Nir and Ulthar.”
— H. P. Lovecraft: The Dream-Quest of Unknown Kadath
Many spells and other rules are based on alignments, and they need some adjustment when the alignment system is not used.
Let’s start with Protection from Evil. In the World of Xoth, this common warding spell is called Protection from Witchcraft, and is also known as the Sign of Xoth.
The spell is identical to the description in the rulebook, except replace all instances of “evil creatures” with “magic-using creatures and supernatural creatures”. Note that any spellcaster is a “magic-using creature” under this definition. A “supernatural creature” is a creature that has one or more supernatural (Su) or spell-like (Sp) abilities.
Magic Circle against Evil is called Magic Circle against Witchcraft (or simply Magic Circle).