I downloaded (exslap) version. And know bout hints in picture book. But don't understand hint "wrong incatation" for 5 ending. (1 ending is alchemist and brewing wrong potions. Right?). And. What do you mean by watering cucumbers?
Check your Mysterious Shell picture! See the hint about the water can in Heaven Oasis? There are these tiny cucumbers around... You actually get pointed towards watering them a few times, but it's okay if you missed it! You can still go and water them!
Wrong incantation? Try pressing J! By now, you're likely to have a certain incantation there!