I got a glyph for the first time, buying with storyline gems from the daily shop, and was curious what exactly it does.
The description says “A very rare upgrade material, used to evolve gear, spells, minions, and followers to legendary and beyond.”
Based on this description, it seems to be very similar to a small blue orb in Gems of War, except around 5x more expensive.
Similar to Gems of War, its main use would likely be to ascend legendary things to mythic. This potentially would bypass the need for the 4 runes/scrolls nor the extra 2 material, potentially saving 6 components.
If this is what it does, it likely would never want to be used on epic to legend due to the lower value. It likely also wouldn’t want to be used on followers due to them already having a 2 piece lower requirement than every other upgradeable thing.
This would make it so getting 5 of these would likely be a good idea and save them for when the game even attempts to be balanced. It likely would be used for 4 spells and 1 weapon to get the legend variant of each to mythic, as these are likely to gain the biggest benefit from being upgraded.