The Beetles in Brusthonin are by far the best possible place you can level from 43 to 45. The beetles can be found just east of Baltasar Hill Village in Brusthonin. Over here you will find roughly 8 - 10 beetles with a extremely fast respawn time.
The beetles around here are all Neutral conning meaning they will not attack you unless you attack them first. Also they are green dotted mobs meaning they are easier to kill then your average mob. If you want to wonder a bit from the camp you can find a few Karnifs around as well as Undead but they are a bit harder to kill.
The beetles will take you all the way to 45. Once you reach level 45 you will want to head to the next area, the Orfaimam's. They can be found in the opposite direction of Baltasar Hill Village, to the west.