NHF – new heroes for Heroes V 3.1.

AGR came up with the idea of a hero who receives a bonus to defense or attack before a battle, depending on the level of the opponent or the dominance of one of the opponent's parameters.

Added 19 minutes later
Regarding the hero who steals artifacts: it's difficult to determine which artifact will be stolen. I also tend to favor a passive ability, meaning it activates right before the battle. I would do the same with Lilith, but unlike artifacts, all slots for creatures can be filled. However, there is a downside - the stolen artifact may not always be used in battle, as it may not be equipped, but this is also a plus for balance. The entire specialization also has a downside: you can act according to the "trickster" principle - steal and run.
For now, I suggest stealing artifacts with the following formula: random minor artifacts of level 0-10, major artifacts of level 10-20, and relics of level 20-40. If the level is 20 and there are no relics, a major artifact is stolen; if there is no major artifact, a minor artifact is stolen....

Added 6 minutes later
I would also like to ask people which heroes they don't like, whether they should be changed, or something else....