Pking

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Being a high level mage could help

Being a 'high level' person

FOOD!!!!!!!!!!!!!!!

Ok.  This one is stupid yet simple.  This might have jus been a waste of time!  Plus this may not benefit you as much as the others unless you come across some one with valuable items on them.  Just go in the wilderness and kill people!  This is called player killing, or pking.  Good luck, oh, and uh...try not to die, if you know what I mean.