In the Sands Of Korgoth, immediately after Mantiac, stock up on Holy Bottles and 
Dark Bottles. Then, go to the Oasis save point, which will automatically heal 
all health and TP. From there, go north, and run around with the Holy Bottle 
until night falls. Once it does, turn on the Dark Bottles. This will bring out 
all the monsters. The ones to look for are the little starfish-like monsters 
(fairly easy to spot). 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. This is an easy way to level up quickly early in the game.