What is cheating is defined by an arch wizard or higher. For example:
Monsters that stop fighting back.
Items that aggravate monsters in no-combat locations.
Monsters that lose (part) their battle abilities.
Monsters that heal players.
Finding infinite or free money source.
Crashing the game (should not be possible).
Roboting (making triggers that do you exp/money etc. while you
are not present)
Playing multiple characters