The Combat Track Primer is a magic textbook created at F.L.A.M.E. Academy. The primer has 3 charges, and it regains 1d3 expended charges daily at dawn. If you make a Strength (Athletics) or a Wisdom (Insight) check while holding the primer, you can expend 1 charge to give yourself a 1d4 bonus to the check, immediately after you roll the d20.
In addition, if you study the primer at the end of a long rest, you can choose one 1st level spell from the sorcerer spell list. Before you finish your next long rest, you can cast the chosen spell once without a spell slot if you are holding the primer. Your spell-casting ability for this spell is your choice of Intelligence, Wisdom, or Charisma.