How about the GMs allow @disguise, so that the players can play trick or treat as the different monsters available in the RO world.
It may be too late. But it would still be fun. XD
Yesterday's the past, tomorrow's the future, and today's a gift. That's why it's called present. If you live today, you'll have tomorrow: you might feel pain, but you might find happiness. There are tears of sadness and tears of joy, but they are far from the same.