For cost efficiency, I recommend sticking with the lower-cost pots. At level 40+ levels, you'll probably want to switch to the higher hp pots, but I still stick to the cheap 240 manna pots because they are a better value. Stay Out of the Abyss: some people feel it is the best place for low-level characters to farm (Abyss gems). I'm not going to debate that here. But the Abyss is not a good place for leveling, because it's too crowded, there isn't much room to maneuver, and monsters spawn all over each room. Pay for Premium: (I listed this last because some people freak out when they read this) a lot of people refuse to pay K2 for Premium because of bugs and issues with the game. Rs GOLD players can do the level 30 Recon quest with other people, but the maps dropped from the scouting soldiers will get distributed across the members of your party, and they can't be traded.