NHF – new heroes for Heroes V 3.1.

I have an idea for a hero – a reaper. I have no idea how to implement it with scripts, but I really hope it can be done somehow. The essence of such a hero is that when attacking, he deals additional damage that guarantees the death of a creature in the stack. The number of creatures that can be killed increases by 1 for every 10 levels of the hero (so that it is not too overpowered against high-level creatures). It would be nice if this also applied to specific creatures (for example, a Haven hero with this bonus for "evil" and neutral creatures).