I don't have too much to add, but I did want to say that I do like the idea of keeping track of the crystals, whether you make the form simpler or keep it as it is. If a person cares about the crystal and/or having their character fill it, you can either submit with your ET or go for the auto route, and it gives you a good timeframe to have it happen.

Though, I'm also interested to see what can be done with them in the future, or what you're willing to elaborate for on their use (I did see the note about this above). I know that crystals can be used as a power source in technology, but I've also personally been interested to see if they can be used on the environment on a grander scale, or with an Arehtei (of that alignment) to influence a change. Or if they're kept in mind alongside with the ET at all, or if that has no bearing on how an Arehtei "is", and is nothing more than a power dump.