Planar dragon

Planar dragons were a subtype of chromatic dragons. They were the result of chromatic dragons living and breeding on other planes and being changed dramatically by the plane.

Abyssal dragons
Abyssal dragons dwelt in the Abyss. Varieties included the frostforged wyrm and deathmask dragon.

Astral dragonss
Astral dragons dwelt in the Astral Sea. Varieties included the battle dragon and pact dragon.

Elemental dragons
Elemental dragons dwelt in the Elemental Chaos (previously the various elemental planes). Varieties included the blazewyrm, dragon eel, tempest dragon, and pyroclastic dragon.

Feywild dragons
Feywild dragons dwelt in the Feywild. Varieties included the faerie dragon, mirage dragon, and wretch dragon.

Shadowfell dragons
Shadowfell dragons dwelt in the Shadowfell. Varieties included the blight dragon and shadow dragon.