Talk:Helpful Hints/@comment-207.191.244.32-20180916224227/@comment-30514476-20180917015800

Coins are used to craft items (talismans, monster banishing weapons, trading items with townspeople) at the Fortune Tellers, Blacksmith, and Inventors.

Rubies are used to buy the things in the Store (energy boosters, talismans, chests).

That's just how the game is designed.