make the event "Hunt the fields" ... then it will tell you what mobs you must kill.
for example 100 Forest Guardians. then go and get 2 Poseidon scrolls.
this will be a double help for you. #1 coz youll get 2 Poseidon stamps, and #2 the "Hunt the fields" event have HP-MP heal potions. :)
last way is to get the Free Food NPC every day.
just remember NOT to sort the today day free food with the yesterday food, coz they will dissapear.. :)