The second level tattoo Ancestral Geometry reads as follows:
Geometric precision and perfect angles signify that an artist with exemplary knowledge of dwarven tattooing traditions created this body art. Your family's ancestral stories, recited throughout the tattooing process, bind your blood even tighter to theirs. During your daily preparations, you manifest a visitation by an ancestor—possibly via a dream, a vision, or a magical trinket left by your bedroll. Roll 2d20 and record the highest result. Then roll 1d6 and note a type of saving throw: 1–2 Fortitude, 3–4 Reflex, and 5–6 Will.
In addition, until the next visitation, you gain a +1 item bonus to one Lore skill related to the ancestor, as determined by the GM. Usually, the ancestor provides a kind of knowledge they believe you'll need. For dwarven ancestors, the Lore skill is usually Architecture Lore, Engineering Lore, Genealogy Lore, Labor Lore, Mining Lore, Warfare Lore, or Lore about a dwarven deity.
Activate (Reaction) envision (fortune); Frequency once per day; Trigger You rolled a saving throw of the noted type; Effect Replace the roll with the d20 roll from your ancestor's visitation.
I'm unsure how to properly implement the second paragraph. My character happens to be a kobold trained in Kobold Lore. If the GM knows our party is likely to encounter kobolds during the upcoming day, I assume they would give that lore skill a temporary +1 item bonus until my next daily preparations. What about a lore skill that my character does not possess but would make thematic sense for my ancestry like Trap Lore or Dragon Lore? Do I temporarily gain that lore skill with a bonus of my intelligence modifier +1 with no proficiency? What other lore skills would be reasonable for a kobold? I assume anything listed in the ancestry entry in the APG?
Typical kobold backgrounds include artisan, artist, criminal, hunter, miner, scout, and tinker from the Core Rulebook, plus bandit, cultist, scavenger, and servant from this book.