I have a homebrew setting that involves a heavily-modified cosmology. None of my planes are identical to the "standard" planes, and the re-used names are only generic ones with heavily-modified meanings. In fact, the only two with identical names are the Astral Plane and the Abyss.
I would like to publish (on a wiki, and potentially more formally) a concordance of sorts for players more familiar with other cosmologies. Basically, a table mapping my_plane to closest standard_plane(s). This would be both for mechanical purposes (any spell that says it involves the <y> standard plane instead uses the <x> custom plane) and for thematic shorthand (generally, beings who live in the <y> standard plane live in <x> custom plane instead).
Can I, without violating the OGL, actually do this by referencing the actual WotC-published, stock-5e-cosmology plane names? If that’s all I do with those names is mention them (without any of the details)?Or is there another sane, understandable way of accomplishing this same task without risking an OGL violation?
From what I can tell, this would fall under nominative fair use as defined in the link:
Nominative fair use permits use of another’s trademark to refer to the trademark owner’s actual goods and services associated with the mark. Nominative fair use generally is permissible as long as (1) the product or service in question is not readily identifiable without use of the trademark, (2) only so much of the mark as is reasonably necessary to identify the product or service is used and (3) use of the mark does not suggest sponsorship or endorsement by the trademark owner.
