The most UNPOPULAR faction in Heroes 5.

if you take Haven with a developed Avenger, you'll understand that for the "duel" mode, the Avenger is much more useful than for the game itself. This is because its sworn enemies depend on the opponent's faction. That is, they will always be there. But in a regular game, it is quite difficult to utilize the Avenger, because the creatures encountered on the map are not necessarily of the opponent's faction.