Wyrmblessed Bloodline introduced primal and imperial dragons, with new damage types like piercing and negative.
Can they be used for example in the Kobold Breath ancestry feat or Dragon Instinct of Barbarians?
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As SpearCarrier.no2's answer mentions, PFS has issued campaign clarification allowing players to select these options for characters with similar draconic connections to the wyrmblessed bloodline.
While it does not call out Kobolds specifically though, I do think they would count just as the draconic bloodline, or draconic instinct would.
The Kobold Ancestry states:
Choose a type of chromatic or metallic dragon to be your exemplar.
Primal and Imperial dragons are not chromatic or metallic.
Barbarian's Dragon Instinct states:
Select a type of dragon from Table 3–4: Dragon Instincts to be your instinct's dragon type.
Primal and Imperial Dragons are not listed on that table, nor are there any rules for adding such to the list of available instincts.
With PFS's note though, it'd be simple to houserule it working the same way.
There is a PFS note in the Dragon Instinct now:
The wyrmblessed sorcerer bloodline provides options for primal and imperial dragons. Character with a similar draconic connection, such as draconic bloodline sorcerors or draconic instinct barbarians, can also select from these dragon types. You must own a copy of Lost Omens: The Mwangi Expanse to select these options.
PFS notes usually (but not always) find their way into the errata, so I would allow it outside of Society play too.