Glass Dragons are a rarity, an extreme rarity. They are translucent, not completely see-through, and their unique appearance made them highly targeted by civilizations around the globe. They are rare not only because of their limited number, but also because they are picky about who their Keeper will be.
Glass Dragons are a classification of Western Dragon, and the full details will only be released to those who receive this binding. They were generally reclusive because in sunlight their bodies would cast colored light around them, making them a target once intelligent species like humans organized and created civilizations. They became the object of prize for quests, the object of magick for practitioners who wanted their "glass" scales, and royalty who wanted any part of the Dragon as a status symbol of the wealth, power, and ingenuity of their kingdom.
They were practitioners of Dragonic magick and possessed a powerful range of abilities and skills which extended to the ability to paralyze targets, sway consciousness, aggressive protective powers, extraordinary sense of smell which could sniff out metals of all kinds, and possessed a unique power of quartz crystal which will be made known to the next Keepers only.
There is no further discount to this binding as it is a true rarity which requires more extensive work.