My idea is to have some sort of scroll that can be written on with a spell. When you use said scroll, it casts the spell, then it breaks. Or deactivates and needs to be charged, idk.
It would be completely useless for survival, but useful for minigames and such. Imagine you organize a battle between two players, they could choose a couple of spells but only use each once, as any battle between friends an i lasts for half a second before they get launched into the air and get demolished by 5 other spells from my book
Idk i think it would be a neat addition. My friends don't know how glyphs work at all, so i can take advantage of that and sell them single use spells for ludicrous amounts of money! How cool would that be?