[quote=Milieu]
Awesome :) I have some concerns regarding Castor's character as well. First off, he bears the last name of the D'Cerf? Is this just an adoptive name applied to those without a surname? (For instance, would Atlas be Atlas D'Cerf simply because he doesn't have an original surname?) Or is this the name of the High Priestess, and she passed it on, if so, wouldn't that mean succession would pass to Castor's character? Originally, I thought D'Cerf was simply a sorta clan name, applicable to anyone apart of it, like how American, is typically used to describe a person from the United States. I might just be nitpicking, but I figured with all the detail put in to make things more succinct that it might pose an issue. Idunno though.
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@Ichthys: This concern I had posted earlier, although I figure its something for you to address. 

@Castor: So do all materials break down over time? And depending on the power level of the spell (especially if its a powerful spell) wouldn't that do more damage to the material itself?
For instance, a glyph engraved on a steel dagger which one could activate to conjure light for, let's say, dungeon crawling, would degrade the blade slowly because I imagine the glyph for making light would be less complex/powerful. But a steel blade that would burst into flames to add more damage would probably degrade much quicker. This is going off your own example of the sticks breaking, I imagine they break because of the magic surging through the material (which would otherwise not stress a material without the glyph). 
This would be a sensible limit, and require your character to balance glyph power with the materials used, and the more rare/durable the material for its properties in conducting magic, could sustain more powerful glyphs.