Crystal dragons, while counted among the weakest of the true dragons, are also by and far some of the most sought after and constant companions one could hope for. Their skittish and nervous behavior balances out an almost gregarious nature they tend to exude, and of all the gem dragons, only the amethyst is more loathe to come to blows with a sentient creature than the crystal.

A crystal dragon is a dazzling creature, its hide white and brilliant in any light, and absolutely radiant in the light of the sun. While this unfortunate trait makes them easy targets for larger dragons, it also lends to their graceful beauty. The most slender and sleek of the gems, the crystal dragon's hide is smooth, seeming to have almost no scales along its length. Wyrmling scales start as a murky quartz, slowly becoming more translucent and reflective as time goes on. As they grow older the crystal dragon's scales become ever more clear, and they seem to catch and hold some small twinkles of dazzling light.

Red dragons view them as nothing more than slaves, and white dragons as nothing more than food, leading the crystal dragon to look at all chromatics with more than a little fear.

Friendly and flippant While cheerful, helpful and friendly, the crystal dragon is also has absolutely no sense of responsibility and absolutely no work ethic. While they are dragons, they only flaunt it to extort things that are "fun" from people and in all other ways try to live life to the fullest. While this makes them careless, the crystal dragon will be absolutely mortified if their antics actually bring harm or hardship to any other being. They are cheerful enough that such an occurrence will not make them stop... but they will still feel bad about it.

Friends of mortals The curious and mischievous crystal dragon is endlessly amused by shorter-lived beings, and goes out of its way to be a welcoming host for them if any come to its home. As long as a person does not try to steal from or harm a crystal, they will always find a helpful, somewhat immature, friend to "play" with. Even the most cruel of warlords has a place in a crystal's home.

Cherished possessions There are only a few things that can cause a crystal dragon to enact violence upon another sentient being, but attempting to steal from one is very, very high on the list. This is because every single piece of their hoard has some sort of sentimental value to the dragon, whether it is a memory of the person that gave them the item, or a mood that they felt when the found it, each part of their hoard is a different part of their life. For this reason, even things as worthless as a discarded shirt or a rosewood anklet could be the absolute prized possession of a crystal dragon, and a visitor must be careful to not cause damage to any item they find within the lair, even if it looks like trash.

For this reason as well, the crystal dragon is shockingly willing to give up some of the most monetarily valuable parts of its hoard for simple baubles and trinkets from mortal friends who are down on their luck and in need of some help, valuing their friendship and cherishing their memories far, far more than some glittery bits of gold.

Polygamous Crystal dragons are very... active. While they might settle down with a partner that makes them happy for a short while, they never do so permanently and are almost always looking for a new mate. For this reason, it is likely a gods send that white dragons do hunt them, otherwise there would be thousands of crystal dragons (and hundreds more on the way), cluttering up the world and finding new brass dragon friends to talk to incessantly.

When they are not on the plane of earth with the other gem dragons, a crystal dragon is typically found in the northern and temperate mountain peaks of the world, where they have few natural predators beyond white dragons and the occasional kraken to contend with. They have no preference for coasts or dry land, and really just try to find some place where giants, and especially bigger, much meaner dragons, cannot reach them.

Lair actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects:

• All sources of light in a 60 foot cube are immediately extinguished, potentially casting the lair into pitch darkness. If this would extinguish all usable light in the lair, then even creatures with darkvision are unable to see on their next round.
• The dragon creates a 20 foot sphere of light on the ground, making it a painful area to look at when moved over. Creatures with eyes treat this sphere as difficult terrain. This sphere remains until the dragon dies or uses this lair action again.
• The dragon causes a spike of crystal to fly from the ground in an attempt to impale a creature. The dragon makes a ranged attack against one creature with a +7 attack bonus, and deals 10 (3d6) piercing damage on a hit.

Regional effects
A legendary crystal dragon's lair is warped by the dragon's magic, creating one or more of the following effects.

• The entirety of the lair slowly becomes more translucent and reflective, from the exterior in. This eventually turns the lair into a perfect prism whenever dawn or sunset strikes it.
• The walls of the lair give off a faint glow, creating dim light throughout the lair. The dragon can extinguish this light at any time it wishes. As long as the walls give off light, then the dragon knows if and approximately where any intruders or guests enter its lair.
• Faded images and shapes appear randomly in the air, drawn from the cherished memories of the dragon and cast along the walls of their crystalline home. These images are silent, and usually happy memories.

If the dragon is slain, the light disappears immediately and permanently, but no other effect will be reversed.