Fiction:The Firmament/Brine Wyrm

"Deep within the waters, where even deepsea dragons dare not venture, they rule."

- Anonymous

Brine wyrms are a species of planar true dragon native to the Plane of Water.

Biology
Brine wyrms are large and heavily-built quadrupedal dragons with bodies covered in deep blue scales like those of fish. Their heads are angular, sporting a pair of curved horns and a pair of large, webbed fins on each side, while a smaller, spiky fin rises from their necks and trails all the way to the tip of their tails. Their large wings are similarly fin-like in structure, which allow the dragon to swim by beating them as if it were flying. Adult brine wyrms reach 24 meters in length.

Ecology
Brine wyrms are the draconic inhabitants of the Plane of Water, making their lairs within its deep cavernous areas. Should they find themselves summoned to the mortal world, they prefer making their homes deep in the oceans.

Society
Brine wyrms live solitary lives, where they watch over their territories with caution. They are not entirely intolerant to the presence of other creatures, but see other dragons as potential rivals.

Abilities
Brine wyrms are masters of all water magic and swim gracefully across any body of it despite their massive body frames. Their breath weapon takes the form of a massive blast of water which can force its way through even the depths of the Plane of Water and deal severe damage to anything caught in its path.