I guess it is just a case of outdated settings information I relied upon because they used to say (somewhere, a book, a web page, a help file I don't remember) that they occur in nature and indeed the existence of at least one predates Talad's awareness of them as revealed
"He called it "Hydlaa", the name of the most powerful glyph, that Vodùl had revealed to Laanx " in the third epoch. Am I misinterpreting this passage
The fact that Talad created all the glyphs in the game does not necessarily mean that he issued by hand each individual glyph, he could have just created the archetypes for each glyph and a Godly magical process that distributed them in a natural seeming way. There may be some other reason why this would not work within the settings, hidden or otherwise unknown to me.
Another thing about my idea is that it would allow for glyphs that have no magical function at all but could be the base for superstitious beliefs, be used for coded messages or some other user defined role play purposes.
As there are effectively an unlimited numbers of glyphs as it currently stands, did Talad really create an infinite amount all in one shot? I suppose that is something that will get dealt with eventually.
Talad also created the Kran but I think there are a few more around now than when he did.