- Units in Heroes 3

the strength of vamp lords increases non-linearly as their number grows;

What does that even mean?.. I think I heard the same thing about wyverns... I checked specifically - everything is within the rules, but I checked wyverns under bless when damage is strictly fixed, it was easier there... Checking vamps is harder because they aren't subject to bless - damage is inconsistent. But then again, all this is very doubtful... Why would that be?

3 different master djinns are noticeably cooler than one squad of master djinns.

Taking abilities into account, I assume?
That's exactly why I'm raising the question - the evaluation of a single independent unit (this is very characteristic for djinns) differs significantly from its evaluation as part of a group - because of abilities...