If you’d like a set of more powerful glyphs, I can create them for you. However, I will need a few things.
First we need something which embodies the element the glyph is designed to protect against. If you follow the riverbanks west and north you will find a cave. In this cave there are ice-like crystals which never melt. Some of those should be sufficient.
In the meantime, I will ask a courier to bring me the other things that I need. Please return once you have the crystals from the cave.