From Pathfinder Society Quest #10: The Broken Scales, which isn't enabled.

Sewer Dragon

BACKGROUND

Attribute Boosts Dexterity or Intelligence, free

Skills Crafting, Kobold Lore

Prerequisites Kobold Ancestry

You are one of the Sewer Dragons, born in Absalom's sewers, strengthened by a life defending your territory.

Choose two attribute boosts. One must be to Dexterity or Intelligence, and one is a free attribute boost. You're trained in the Crafting skill and the Kobold Lore skill. You gain the Snare Crafting skill feat.

Pathfinder Society Quest #10: The Broken ScalesOGL