Whenever you get the Crush spell from Blimp buy some ingredients for the spell and exit the cave Go through the cave near Blimps cave and you will exit from another cave You will see a Mad Monk Level up Crush by casting it on the Mad Monk When he dies exit to the west and reenter to repeatedly kill him When you run out of ingredients buy more with the money that you have earned As the spell gets stronger target more enemies to gain even more money Continue this process until Crush is at Level 998 Crush will then be strong enough to kill nearly any future Boss in two to four hits