It is fairly easy for any class of character to reach level 12 in Last Chaos. When you begin the game you automatically spawn inside Juno's main city; Randol. Leaving Randol city through either of the gates will bring you onto the open Juno map. The lowest level monsters are nearest to the gates. Start off by attacking deer and foxes. Attacking a jaguar or wolf may seem like a good idea but you will soon realise that they are defensive pack animals and they will join forces to defend themselves against you and it is very unlikely that your character is strong enough to defeat an entire mob.
If you do find yourself being surrounded by aggressive monsters run back to town as fast as possible. Buying some speed boost potions before you begin training is a good idea if you can afford some.
You can check the level of a monster by clicking on it. A monster who is green or blue is a lower level than you; this means they will be easy to kill, but they will not award you a lot of experience. A monster that is yellow, red or orange is a higher level than you and you should avoid them unless you are confident that your defence is high enough to withstand their attack. White monsters are the same level as you, which makes them the best choice. If you want to level faster buying a lot of defence, attack and health potions and attacking a yellow monster can yield good results. If you want to go down this route remember to avoid aggressive monsters so you can rest in between attacks.
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In your player menu you can find the mentor option. You can apply to be mentored by someone or announce in the town centre that you wish to be mentored. The majority of players do not undertake the responsibility of helping someone level, but you could get lucky (especially on a non-pvp server) and find yourself being power levelled by a fellow player.