I'm having a hard time finding better glyph's. It is my second play through, and I have looked many places. I'm starting to wonder if they even go over 2%. What are the glyph locations, in The Witcher 3?
There are three levels of Glyph - Lesser Glyph (2%), Glyph (5%), and Greater Glyph (10%).
They can be found in loot, but this is random. The chance of finding better Glyphs increases as you gain experience.
You can also buy them from shopkeepers, armors and blacksmiths. Again what they have is random.
Finally you can find Diagrams for the different types of Glyph. With these Armors and Blacksmiths can upgrade Glyphs, but only if they have enough experience.