Dwarf Sorcerer (for the Species feat)
Elemental Heritage: Mist/Smoke (your fat CON will make up for the -2 Fortitude saves)
Draconic Heritage (stacking thick skin at least paints a picture of a Martial artist not using Armor)
Martial Artist (focused on CON, duh) Level 4 (Masters Art as Bonus feat @3)
Level 5, Force of Nature - RAWR! Path of Darkness I (you now have Darkvision II)
Level 6 feat, Draconic Legacy (do not grow wings, you will need your action dice)
Level 8 (Force of Nature 4) - go Full elemental, the benefits are too huge.
At this point, you have a fire Breath Weapon, and an elemental smoke blast (which does 2d8 Stress, +4 DC due to Terrifying look)
and you use your CON (+4 Dwarf, +1 Elemental Legacy, +1 Force of Nature, +2 for level
for your unarmed hit and damage and defense and initiative.
Might even consider the Dragon master at level 10, why not?