To easily gain experience in the Sands Of Korgoth immediately after Mantiac, stock up on Holy Bottles and Dark Bottles. Make your way to the Oasis save point. This save point is particular, as you will automatically heal all health and TP with it. From there, go north and run around with the Holy Bottle until night falls. Once it does, turn on the Dark Bottles. This will draw out all the monsters. The ones to look for are the little starfish-like monsters. They run very fast towards you. Engage in battle with them. You will receive 800 experience points for each one defeated. You can easily catch between six to eight of them per night. Nights last for about three minutes, resulting in about 4,800 to 6,400 experience points every time night falls.