There is only one drachma. Get it from the guy in the underworld (Hades temple) for cleaning the graffiti. You will need it near the end of the game on the way to Mount Olympus.
Go back to the Tree of Immortality. (you cannot enter the throne rooms right now) The goddess Athena will tell you that the Sacred Items are dangerous. Rearrange the messages on them to read......
If you clean Zeus' graffiti off of Hades temple, the worker will give one drachma. This is only needed near the climb of Mt. Olympus near the end of the quest. It is used to buy a bag of wind from...
first you get the golden apple and get the mission then go past the goat man (satyr) then go off the cliff then click on the boy then clean all the stuff off of hades temple then click on him and he...