A fan called Curio wrote a very detailed guide about cheating in Heroes of Might and Magic V. Since the game doesn't include traditional cheats, you must edit the game's script to add bonuses such as skills, spells and creatures to your hero. That discovery was originally made by Wrongusername a month ago. Those cheats will require you to change a text file and enter console commands, but the explanation is simple and user-friendly. Check it out at Age of Heroes.

Of course, the half-dozen of players who currently play online on a regular basis should not use these cheats. If you had an Inferno opponent suddenly rush your castle with 60 Archangels, now you know how he did it.