Booster Pack Heroes: How Do I Get More Relic Packs?
Short answer
Suggested fix (unconfirmed): Unlock the upgrade that grants a 25% chance for a relic pack on a jackpot, then grind jackpots while speeding through levels between visits to the skill tree.
The problem
I'm missing a bunch of relics, and i have no clue on how to get more of the packs.
Suggested fix (unconfirmed): Farm foil points to hit shop jackpots for a 25% chance to get a relic booster, and check the relics page for remaining question marks.
Suggested fix (unconfirmed): Update the game and open another relic pack. If still stuck at 38/39, roll the shop to hit jackpots for a 25% chance of getting a relic pack.