I think for a single spell there's fairly little you'd need to modify (just the actual text of the description, and changing unique names). Not even changing d

I think for a single spell there's fairly little you'd need to modify (just the actual text of the description, and changing unique names). Not even changing damage dice. The problem is making a whole spellbook with a one-to-one correspondence to WoTC's spellbook, even if each of those entries has been modified. The spellbook is more than just a bunch of separate spells - it's a collection carefully designed for balanced gameplay and has protection in itself. See [1] for one way that "compilations" can be treated as having more rights. The EU also allows copyright of databases [2], and I think the spell list meets the criteria. And don't forget you'd also be doing the same thing with races, classes, equipment, monsters, conditions, deities, feats, blah blah blah. Put together I think it's pretty likely to be infringing somewhere! Certainly enough that a lawsuit isn't getting dismissed. [1] https://www.copyright.gov/circs/circ14.pdf https://www.copyright.gov/circs/circ14.pdf [2] https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31996L0009:EN:HTML https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX...