Is there anything preventing players from cheesing this? Genuine question, as I went through the sections again and I didn't see anything preventing glyphs from being put somewhere unreachable for the average player, concealing a glyph, placing them behind a different spell like ward of secrets/spiteful god, or even inscribing the glyphs over a material like boomsteel that would force the players to hurt themselves to remove it.
I approach someone I don't like oocly when they're alone, knowing they have a culturally dubious magic, and I now have an excuse to screw them over irp. Not to mention court trials or similar situations where it can be used as a definitive method to spot out mages. Just some I was able to think up, there could be more.
The definition of half should be specified. Would a mystic using saturation only take half of someone's soul? Some magics are less definitive in that taking half of the strength is vague and needs more clarification.
Does this mean the magic is common knowledge? I understand that isn't where you were going with this, but you should clarify that as well if you don't want people conveniently knowing what every glyph does.
Hope these questions help, I'd much rather have more ritualistic based magics on here and this has potential.