-fd-god-: There should be special potions that can be used while fighting a battle or on the map... E.g:
*light potion: blids the enemy for 1 battle- 1 credit
*death potion: gives you a 50% to kill the enemy straight away but there is also a 50% chance that the monster will turn to a epic dragon which kill everyone on the map. - 500k gold
If you have any other idead please add them here