Chromatic Warding and, alternatively, Psionic mind + Gem Flight are pretty good. I understand why Psionic mind wouldn't be added, though. There's so many encounters it could influence, it's a lot of work.
http://dnd5e.wikidot.com/lineage:dragonborn#toc4
I'd just like to say that there are multiple ways to give a party member artificial dark vision in the game. It sucks when you have too many in the party, but 1 is manageable as soon as you need it. You'll eventually be able to support more. It'd like it much better if Larian build on the dragonborn's existing tankiness by adding chromatic warding.
(Like Blackheifer, I find the cat eye pupils confusing, though. Those are not eyes that have trouble seeing in low light).
