I hope I'm just missing something, but barbarian dragon form says to use everything the dragon form spell would give you except to use your own ac and attack modifier (at least until you hit eighteenth level in which case it becomes a little clearer).
Where my confusion comes in is breath weapon DC; in the spell description it says to use your spell DC, which barbarians don't have (again until you get to 18th level, where is says the breath DC becomes 30). Is there something I'm missing?
DC are class DC :
10+Proficiency Bonus+Key Ability Modifier.
So trained class DC: 10+2+Str modifier for a Barbarian. It would be decent but definitely not as much as DC 30 at level 18 upgrade.
(I didn't double-check if Barbarian Class DC proficiency bonus increase for this example)
But the spell specifies spell DC, not class DC. Is there that says if you don't have a spell DC use class DC instead?
Yeah I hate stuff like this, where it seems they forgot to add stuff haha. But I know they were bound to with so much content.
It also makes me feel nervous to use class dc as it's so much higher than the thirty they say it is at 18th level; but 30 is pretty crazy low compared to what the spell DC would be. You're probably right however