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From Pathfinder Society Clockwork Mystery Player's Guide, which isn't enabled.

Battle's Spark

BACKGROUND
Attribute Boosts Constitution or Strength, free
Skills Survival, Warfare Lore

You saw the Pathfinder Society helping during the Hellfire Crisis and were filled with hope and purpose. You signed up on the spot and are now a full-fledged agent.

Choose two attribute boosts. One must be to Strength or Constitution, and one is a free attribute boost.

You're trained in the Survival skill and the Warfare Lore skill. You gain the Experienced Tracker skill feat.

Pathfinder Society Clockwork Mystery Player's GuideORC