NHF – new heroes for Heroes V 3.1.

in my opinion, simply reducing stats isn't interesting – it could be done to achieve a certain level of universality (i.e., without depending on whether the enemy has or doesn't have artifacts) by lowering their stats (or increasing your own in opposition to the enemy's stats). A special ability tied to the artifacts worn by the enemy would be interesting if it reduced not just basic stats, but effects such as elemental defense/enhancement or speed bonus, and so on.