A RDM would be a lot more effective with how this game is set up, having the ability to cure and nuke some also being able to stand in the front lines and smash a mob with a sword or dagger with some kind of Enspell would be neat. Since it doesn't use a skill system the nukes would actually be effective, cure is already effective, and all melee is effective in some since or another. Though I guess debuffing would be big for them as well, since there really isn't much of that in the game right now for bosses.